Matthieu Patou
2010-Jan-20 08:30 UTC
[Xen-users] x64 hvm linux very slow on a x64 xen host
Hello, I''m trying to use Fedora x64 on a xen x64 host in hvm mode and the domU is _very_ slow. I am wondering if there is any tunning possible ? Matthieu. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2010-Jan-20 09:47 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On Wed, Jan 20, 2010 at 11:30:37AM +0300, Matthieu Patou wrote:> Hello, > > I''m trying to use Fedora x64 on a xen x64 host in hvm mode and the domU > is _very_ slow. > I am wondering if there is any tunning possible ? >You''d have to pv-on-hvm drivers to get good IO performance. Other (easier) option is to use Fedora PV guest, instead of HVM. -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Matthieu Patou
2010-Jan-20 10:06 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On 20/01/2010 12:47, Pasi Kärkkäinen wrote:> On Wed, Jan 20, 2010 at 11:30:37AM +0300, Matthieu Patou wrote: > >> Hello, >> >> I''m trying to use Fedora x64 on a xen x64 host in hvm mode and the domU >> is _very_ slow. >> I am wondering if there is any tunning possible ? >> >> > You''d have to pv-on-hvm drivers to get good IO performance. >Where can I get them ?> Other (easier) option is to use Fedora PV guest, instead of HVM. > >Yeah I''m thinking about converting my image to PV but I was just wondering why is so slow ... Note that fedora i386 do not look so slow on the same xen x64 host Matthieu. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fajar A. Nugraha
2010-Jan-20 10:20 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On Wed, Jan 20, 2010 at 5:06 PM, Matthieu Patou <mat+Informatique.xen@matws.net> wrote:> Note that fedora i386 do not look so slow on the same xen x64 hostDo you have apic enabled on domU config file? -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2010-Jan-20 10:23 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On Wed, Jan 20, 2010 at 01:06:32PM +0300, Matthieu Patou wrote:> On 20/01/2010 12:47, Pasi Kärkkäinen wrote: >> On Wed, Jan 20, 2010 at 11:30:37AM +0300, Matthieu Patou wrote: >> >>> Hello, >>> >>> I''m trying to use Fedora x64 on a xen x64 host in hvm mode and the domU >>> is _very_ slow. >>> I am wondering if there is any tunning possible ? >>> >>> >> You''d have to pv-on-hvm drivers to get good IO performance. >> > Where can I get them ? >What Fedora version are you using? What kernel?>> Other (easier) option is to use Fedora PV guest, instead of HVM. >> >> > Yeah I''m thinking about converting my image to PV but I was just > wondering why is so slow ... > Note that fedora i386 do not look so slow on the same xen x64 host >Yeah that''s weird.. Did you measure Xen cpu usage with "xm top" in dom0? What''s using the CPU? Is there any load on dom0? Check with "top". How did you measure the HVM guest is slow? -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Matthieu Patou
2010-Jan-22 21:54 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On 20/01/2010 13:20, Fajar A. Nugraha wrote:> On Wed, Jan 20, 2010 at 5:06 PM, Matthieu Patou > <mat+Informatique.xen@matws.net> wrote: > >> Note that fedora i386 do not look so slow on the same xen x64 host >> > Do you have apic enabled on domU config file? > >Here is my configuation: import os, re, time arch = os.uname()[4] if re.search(''64'', arch): arch_libdir = ''lib64'' else: arch_libdir = ''lib'' kernel = "/usr/lib/xen-3.2-1/boot/hvmloader" builder=''hvm'' memory = 512 shadow_memory = 16 name = "smbfevz02" vif = [ ''bridge=br99'' ] disk = [ ''phy:/dev/vgecvhvnn01-01/smbfevz02,hda,w'',''file:/mnt/Fedora-12-x86_64-Live.iso,hdc:cdrom,r''] device_model = ''/usr/'' + arch_libdir + ''/xen-3.2-1/bin/qemu-dm'' boot="c" acpi = 1 apic = 1 sdl=0 vnc=1 usb=1 usbdevice=''tablet'' rtc_timeoffset=-(time.altzone)+600 localtime=1 vncconsole=1 monitor=1 serial=''pty'' vncviewer = 0 vcpus=2 independent_wallclock = 1 vncdisplay=0 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Matthieu Patou
2010-Jan-22 22:48 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On 20/01/2010 13:23, Pasi Kärkkäinen wrote:> On Wed, Jan 20, 2010 at 01:06:32PM +0300, Matthieu Patou wrote: > >> On 20/01/2010 12:47, Pasi Kärkkäinen wrote: >> >>> On Wed, Jan 20, 2010 at 11:30:37AM +0300, Matthieu Patou wrote: >>> >>> >>>> Hello, >>>> >>>> I''m trying to use Fedora x64 on a xen x64 host in hvm mode and the domU >>>> is _very_ slow. >>>> I am wondering if there is any tunning possible ? >>>> >>>> >>>> >>> You''d have to pv-on-hvm drivers to get good IO performance. >>> >>> >> Where can I get them ? >> >> > What Fedora version are you using? What kernel? >So it''s an install from the live cd of Fedora 12 x64.> >>> Other (easier) option is to use Fedora PV guest, instead of HVM. >>> >>> >>> >> Yeah I''m thinking about converting my image to PV but I was just >> wondering why is so slow ... >> Note that fedora i386 do not look so slow on the same xen x64 host >> >> > Yeah that''s weird.. > > Did you measure Xen cpu usage with "xm top" in dom0? > >Not yet i''ll retry soon. I''ll let you know.> What''s using the CPU? > Is there any load on dom0? Check with "top". > > How did you measure the HVM guest is slow? > >Because compiling samba 4 in this host takes ages although in fedora 386 with the same code the speed is way better. Matthieu. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fajar A. Nugraha
2010-Jan-23 00:43 UTC
Re: [Xen-users] x64 hvm linux very slow on a x64 xen host
On Sat, Jan 23, 2010 at 4:54 AM, Matthieu Patou <mat+Informatique.xen@matws.net> wrote:>>> Note that fedora i386 do not look so slow on the same xen x64 host>> Do you have apic enabled on domU config file?> apic = 1try disabling it (apic=0) If it still doesn''t help, try adding "noapic nolapic" to grub.conf kernel line. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users