Hi I have Centos 5 server run XEN, the server has about 10 Hosts on it. It was happly running fine with 4GB of ram. I then needed to upgrade the servers ram to 8GB. This all went well server booted, but it now the server is very slow, to the point that when I run "xm list" can brew myself some coffee. any one have any idea why this is happening. Regards joe _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
> This all went well server booted, but it now the server is very slow, to > the point that when I run "xm list" can brew myself some coffee.Did you memtest the memory? Anything in dmesg, logs? Is it 64bit or 32bit box? Does the OS actually detect all the memory? Have you tested your server with some other (maybe non-xen) kernel? Is it still slow? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Joe Black wrote:> Hi > > I have Centos 5 server run XEN, the server has about 10 Hosts on it. > It was happly running fine with 4GB of ram. I then needed to upgrade > the servers ram to 8GB. > > This all went well server booted, but it now the server is very slow, > to the point that when I run "xm list" can brew myself some coffee. > > any one have any idea why this is happening. > > Regards > > joe > > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-usersWhat kernel are you running, and what architecture are you using, 32bit or 64bit? What does free -m report? and how much RAM does dmesg report? -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Wow, Thanks for the speedy reply. Ok this is what I have UNAME: 2.6.18-8.el5xen #1 SMP Thu Mar 15 21:02:53 EDT 2007 i686 i686 i386 GNU/Linux OS: Centos5 ARCH I386 free -m: total used free shared buffers cached Mem: 254 212 42 0 38 59 -/+ buffers/cache: 114 140 Swap: 8001 0 8001 MEMINFO MemTotal: 260864 kB MemFree: 43220 kB Buffers: 39452 kB Cached: 61112 kB SwapCached: 0 kB Active: 58168 kB Inactive: 58376 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 260864 kB LowFree: 43220 kB SwapTotal: 8193140 kB SwapFree: 8193044 kB Dirty: 8 kB Writeback: 0 kB AnonPages: 16016 kB Mapped: 7232 kB Slab: 18244 kB PageTables: 1432 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 8323572 kB Committed_AS: 179560 kB VmallocTotal: 589816 kB VmallocUsed: 8104 kB VmallocChunk: 581664 kB DMESG: Memory: 185216k/270336k available (2017k kernel code, 76576k reserved, 824k data, 172k init, 0k highmem) On second not I am allocating 256Mb to Dom0 on boot. Ryan On Fri, 2008-05-23 at 09:48 +0200, Rudi Ahlers wrote:> Joe Black wrote: > > Hi > > > > I have Centos 5 server run XEN, the server has about 10 Hosts on it. > > It was happly running fine with 4GB of ram. I then needed to upgrade > > the servers ram to 8GB. > > > > This all went well server booted, but it now the server is very slow, > > to the point that when I run "xm list" can brew myself some coffee. > > > > any one have any idea why this is happening. > > > > Regards > > > > joe > > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > What kernel are you running, and what architecture are you using, 32bit > or 64bit? What does free -m report? and how much RAM does dmesg report? >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Joe Black wrote:> Wow, Thanks for the speedy reply. > > Ok this is what I have > > UNAME: 2.6.18-8.el5xen #1 SMP Thu Mar 15 21:02:53 EDT 2007 i686 i686 > i386 GNU/Linux > OS: Centos5 > ARCH I386 > > free -m: > > total used free shared buffers cached > Mem: 254 212 42 0 38 59 > -/+ buffers/cache: 114 140 > Swap: 8001 0 8001 > > MEMINFO > MemTotal: 260864 kB > MemFree: 43220 kB > Buffers: 39452 kB > Cached: 61112 kB > SwapCached: 0 kB > Active: 58168 kB > Inactive: 58376 kB > HighTotal: 0 kB > HighFree: 0 kB > LowTotal: 260864 kB > LowFree: 43220 kB > SwapTotal: 8193140 kB > SwapFree: 8193044 kB > Dirty: 8 kB > Writeback: 0 kB > AnonPages: 16016 kB > Mapped: 7232 kB > Slab: 18244 kB > PageTables: 1432 kB > NFS_Unstable: 0 kB > Bounce: 0 kB > CommitLimit: 8323572 kB > Committed_AS: 179560 kB > VmallocTotal: 589816 kB > VmallocUsed: 8104 kB > VmallocChunk: 581664 kB > > DMESG: Memory: 185216k/270336k available (2017k kernel code, 76576k > reserved, 824k data, 172k init, 0k highmem) > > On second not I am allocating 256Mb to Dom0 on boot. > > Ryan > > On Fri, 2008-05-23 at 09:48 +0200, Rudi Ahlers wrote: >> Joe Black wrote: >> > Hi >> > >> > I have Centos 5 server run XEN, the server has about 10 Hosts on it. >> > It was happly running fine with 4GB of ram. I then needed to upgrade >> > the servers ram to 8GB. >> > >> > This all went well server booted, but it now the server is very slow, >> > to the point that when I run "xm list" can brew myself some coffee. >> > >> > any one have any idea why this is happening. >> > >> > Regards >> > >> > joe >> > >> > ------------------------------------------------------------------------ >> > >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> >> > http://lists.xensource.com/xen-users >> What kernel are you running, and what architecture are you using, 32bit >> or 64bit? What does free -m report? and how much RAM does dmesg report? >> >> > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-usersAs you can see, it''s not picking up the new RAM :) This will help: http://blog.softdux.com/everything-todo-with-linux/help-centos-51-xen-kernel-doesnt-see-all-the-ram-in-my-pc.html -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Excuse the ignorance, but where do you see that is is not picking up the 8Gb of RAM ? Ryan On Fri, 2008-05-23 at 10:43 +0200, Rudi Ahlers wrote:> Joe Black wrote: > > Wow, Thanks for the speedy reply. > > > > Ok this is what I have > > > > UNAME: 2.6.18-8.el5xen #1 SMP Thu Mar 15 21:02:53 EDT 2007 i686 i686 > > i386 GNU/Linux > > OS: Centos5 > > ARCH I386 > > > > free -m: > > > > total used free shared buffers cached > > Mem: 254 212 42 0 38 59 > > -/+ buffers/cache: 114 140 > > Swap: 8001 0 8001 > > > > MEMINFO > > MemTotal: 260864 kB > > MemFree: 43220 kB > > Buffers: 39452 kB > > Cached: 61112 kB > > SwapCached: 0 kB > > Active: 58168 kB > > Inactive: 58376 kB > > HighTotal: 0 kB > > HighFree: 0 kB > > LowTotal: 260864 kB > > LowFree: 43220 kB > > SwapTotal: 8193140 kB > > SwapFree: 8193044 kB > > Dirty: 8 kB > > Writeback: 0 kB > > AnonPages: 16016 kB > > Mapped: 7232 kB > > Slab: 18244 kB > > PageTables: 1432 kB > > NFS_Unstable: 0 kB > > Bounce: 0 kB > > CommitLimit: 8323572 kB > > Committed_AS: 179560 kB > > VmallocTotal: 589816 kB > > VmallocUsed: 8104 kB > > VmallocChunk: 581664 kB > > > > DMESG: Memory: 185216k/270336k available (2017k kernel code, 76576k > > reserved, 824k data, 172k init, 0k highmem) > > > > On second not I am allocating 256Mb to Dom0 on boot. > > > > Ryan > > > > On Fri, 2008-05-23 at 09:48 +0200, Rudi Ahlers wrote: > >> Joe Black wrote: > >> > Hi > >> > > >> > I have Centos 5 server run XEN, the server has about 10 Hosts on it. > >> > It was happly running fine with 4GB of ram. I then needed to upgrade > >> > the servers ram to 8GB. > >> > > >> > This all went well server booted, but it now the server is very slow, > >> > to the point that when I run "xm list" can brew myself some coffee. > >> > > >> > any one have any idea why this is happening. > >> > > >> > Regards > >> > > >> > joe > >> > > >> > ------------------------------------------------------------------------ > >> > > >> > _______________________________________________ > >> > Xen-users mailing list > >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> > >> > http://lists.xensource.com/xen-users > >> What kernel are you running, and what architecture are you using, 32bit > >> or 64bit? What does free -m report? and how much RAM does dmesg report? > >> > >> > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > As you can see, it''s not picking up the new RAM :) > This will help: > http://blog.softdux.com/everything-todo-with-linux/help-centos-51-xen-kernel-doesnt-see-all-the-ram-in-my-pc.html >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Joe Black wrote:> Hi > > Excuse the ignorance, but where do you see that is is not picking up > the 8Gb of RAM ? > > Ryan > > On Fri, 2008-05-23 at 10:43 +0200, Rudi Ahlers wrote: >> Joe Black wrote: >> > Wow, Thanks for the speedy reply. >> > >> > Ok this is what I have >> > >> > UNAME: 2.6.18-8.el5xen #1 SMP Thu Mar 15 21:02:53 EDT 2007 i686 i686 >> > i386 GNU/Linux >> > OS: Centos5 >> > ARCH I386 >> > >> > free -m: >> > >> > total used free shared buffers cached >> > Mem: 254 212 42 0 38 59 >> > -/+ buffers/cache: 114 140 >> > Swap: 8001 0 8001 >> > >> > MEMINFO >> > MemTotal: 260864 kB >> > MemFree: 43220 kB >> > Buffers: 39452 kB >> > Cached: 61112 kB >> > SwapCached: 0 kB >> > Active: 58168 kB >> > Inactive: 58376 kB >> > HighTotal: 0 kB >> > HighFree: 0 kB >> > LowTotal: 260864 kB >> > LowFree: 43220 kB >> > SwapTotal: 8193140 kB >> > SwapFree: 8193044 kB >> > Dirty: 8 kB >> > Writeback: 0 kB >> > AnonPages: 16016 kB >> > Mapped: 7232 kB >> > Slab: 18244 kB >> > PageTables: 1432 kB >> > NFS_Unstable: 0 kB >> > Bounce: 0 kB >> > CommitLimit: 8323572 kB >> > Committed_AS: 179560 kB >> > VmallocTotal: 589816 kB >> > VmallocUsed: 8104 kB >> > VmallocChunk: 581664 kB >> > >> > DMESG: Memory: 185216k/270336k available (2017k kernel code, 76576k >> > reserved, 824k data, 172k init, 0k highmem) >> > >> > On second not I am allocating 256Mb to Dom0 on boot. >> > >> > Ryan >> > >> > On Fri, 2008-05-23 at 09:48 +0200, Rudi Ahlers wrote: >> >> Joe Black wrote: >> >> > Hi >> >> > >> >> > I have Centos 5 server run XEN, the server has about 10 Hosts on it. >> >> > It was happly running fine with 4GB of ram. I then needed to upgrade >> >> > the servers ram to 8GB. >> >> > >> >> > This all went well server booted, but it now the server is very slow, >> >> > to the point that when I run "xm list" can brew myself some coffee. >> >> > >> >> > any one have any idea why this is happening. >> >> > >> >> > Regards >> >> > >> >> > joe >> >> > >> >> > ------------------------------------------------------------------------ >> >> > >> >> > _______________________________________________ >> >> > Xen-users mailing list >> >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> <mailto:Xen-users@lists.xensource.com> >> >> > http://lists.xensource.com/xen-users >> >> What kernel are you running, and what architecture are you using, 32bit >> >> or 64bit? What does free -m report? and how much RAM does dmesg report? >> >> >> >> >> > ------------------------------------------------------------------------ >> > >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> >> > http://lists.xensource.com/xen-users >> As you can see, it''s not picking up the new RAM :) >> This will help: >> http://blog.softdux.com/everything-todo-with-linux/help-centos-51-xen-kernel-doesnt-see-all-the-ram-in-my-pc.html >> >> > ------------------------------------------------------------------------ > >> MEMINFO > MemTotal: 260864 kB > MemFree: 43220 kB > Buffers: 39452 kBThat shows only 2GB :) -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi. --On Friday, May 23, 2008 05:39:14 PM +0200 Rudi Ahlers <Rudi@SoftDux.com> wrote:>> MEMINFO >> MemTotal: 260864 kB > > That shows only 2GB :)As far as I understand it, that''s only for the dom0. Take a look at xentop or xm info, they both show (at least on my 3.2 dom0) the "real" amount of memory that''s available to the hypervisor. Greetings, Jens _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Joe Black wrote:> Hi > > Excuse the ignorance, but where do you see that is is not picking up > the 8Gb of RAM ? > > RyanI see that the kernel is a number of minor revisions out of date. Time to run ''yum update''!!!> On Fri, 2008-05-23 at 10:43 +0200, Rudi Ahlers wrote: >> Joe Black wrote: >> > Wow, Thanks for the speedy reply. >> > >> > Ok this is what I have >> > >> > UNAME: 2.6.18-8.el5xen #1 SMP Thu Mar 15 21:02:53 EDT 2007 i686 i686 >> > i386 GNU/Linux >> > OS: Centos5 >> > ARCH I386 >> > >> > free -m: >> > >> > total used free shared buffers cached >> > Mem: 254 212 42 0 38 59 >> > -/+ buffers/cache: 114 140 >> > Swap: 8001 0 8001 >> > >> > MEMINFO >> > MemTotal: 260864 kB >> > MemFree: 43220 kB >> > Buffers: 39452 kB >> > Cached: 61112 kB >> > SwapCached: 0 kB >> > Active: 58168 kB >> > Inactive: 58376 kB >> > HighTotal: 0 kB >> > HighFree: 0 kB >> > LowTotal: 260864 kB >> > LowFree: 43220 kB >> > SwapTotal: 8193140 kB >> > SwapFree: 8193044 kB >> > Dirty: 8 kB >> > Writeback: 0 kB >> > AnonPages: 16016 kB >> > Mapped: 7232 kB >> > Slab: 18244 kB >> > PageTables: 1432 kB >> > NFS_Unstable: 0 kB >> > Bounce: 0 kB >> > CommitLimit: 8323572 kB >> > Committed_AS: 179560 kB >> > VmallocTotal: 589816 kB >> > VmallocUsed: 8104 kB >> > VmallocChunk: 581664 kB >> > >> > DMESG: Memory: 185216k/270336k available (2017k kernel code, 76576k >> > reserved, 824k data, 172k init, 0k highmem) >> > >> > On second not I am allocating 256Mb to Dom0 on boot. >> > >> > Ryan >> > >> > On Fri, 2008-05-23 at 09:48 +0200, Rudi Ahlers wrote: >> >> Joe Black wrote: >> >> > Hi >> >> > >> >> > I have Centos 5 server run XEN, the server has about 10 Hosts on it. >> >> > It was happly running fine with 4GB of ram. I then needed to upgrade >> >> > the servers ram to 8GB. >> >> > >> >> > This all went well server booted, but it now the server is very slow, >> >> > to the point that when I run "xm list" can brew myself some coffee. >> >> > >> >> > any one have any idea why this is happening. >> >> > >> >> > Regards >> >> > >> >> > joe >> >> > >> >> > ------------------------------------------------------------------------ >> >> > >> >> > _______________________________________________ >> >> > Xen-users mailing list >> >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> <mailto:Xen-users@lists.xensource.com> >> >> > http://lists.xensource.com/xen-users >> >> What kernel are you running, and what architecture are you using, 32bit >> >> or 64bit? What does free -m report? and how much RAM does dmesg report? >> >> >> >> >> > ------------------------------------------------------------------------ >> > >> > _______________________________________________ >> > Xen-users mailing list >> > Xen-users@lists.xensource.com <mailto:Xen-users@lists.xensource.com> >> > http://lists.xensource.com/xen-users >> As you can see, it''s not picking up the new RAM :) >> This will help: >> http://blog.softdux.com/everything-todo-with-linux/help-centos-51-xen-kernel-doesnt-see-all-the-ram-in-my-pc.html >> >> > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi Thanks everyone for your help. I have sorted out the issue by not limiting the DOM-0 to 256MB. Now the server is fast again. Thanks everyone. Ryan On Fri, 2008-05-23 at 20:43 +0200, Jens Dönhoff wrote:> Hi. > > --On Friday, May 23, 2008 05:39:14 PM +0200 Rudi Ahlers > <Rudi@SoftDux.com> wrote: > > >> MEMINFO > >> MemTotal: 260864 kB > > > > That shows only 2GB :) > > As far as I understand it, that''s only for the dom0. > > Take a look at xentop or xm info, they both show (at least on my 3.2 > dom0) the "real" amount of memory that''s available to the hypervisor. > > Greetings, > > Jens > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users