search for: 1mb

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2016 Jul 28
2
[PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
...p_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > > + hdr_len = sizeof(struct balloon_bmap_hdr); > > > + vb->bmap_hdr = kzalloc(hdr_len + vb->bmap_len, GFP_KERNEL); > > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. How big > > was the pfn buffer before? > > Yes, it is if the max pfn is more than 32GB. > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too small, > and it's the main reason for bad performance. > Use the...
2016 Jul 28
2
[PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
...p_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > > > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > > > + hdr_len = sizeof(struct balloon_bmap_hdr); > > > + vb->bmap_hdr = kzalloc(hdr_len + vb->bmap_len, GFP_KERNEL); > > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. How big > > was the pfn buffer before? > > Yes, it is if the max pfn is more than 32GB. > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too small, > and it's the main reason for bad performance. > Use the...
2005 Dec 18
2
Could someone host my 1mb rails app??
Hi Everyone, Would someone be able to do a huge favor for me and host a very small 1mb rails app for me?? I can''t get my hosting up and running yet and I really need it up and running by today for my professor to check it off. I only need it up for about two weeks. You will get a lot of karma points for it :) Thanks in advance!! Jordan -- Posted via http://w...
2010 Jul 28
6
Read ahead / prefetching
Hi, I am trying to educate myself on prefetching/readahead algorithm for Lustre''s read. For a starter I only have two simple questions. 1 - Does Lustre detect linear or random I/O pattern or it always triggers readahead? 2 - If readahead is triggered, how many pages are read in addition to what is necessary? Thanks, Arifa.
2016 Jul 28
3
[virtio-dev] Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
On Thu, Jul 28, 2016 at 06:36:18AM +0000, Li, Liang Z wrote: > > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. > > > > How big was the pfn buffer before? > > > > > > Yes, it is if the max pfn is more than 32GB. > > > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too > > > small, and it's the...
2016 Jul 28
3
[virtio-dev] Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
On Thu, Jul 28, 2016 at 06:36:18AM +0000, Li, Liang Z wrote: > > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. > > > > How big was the pfn buffer before? > > > > > > Yes, it is if the max pfn is more than 32GB. > > > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too > > > small, and it's the...
2006 Dec 18
1
Extract ElTorio No Emulation image and boot from PXE ?
...rio No Emulation image and boot from PXE ? Is this possible, can PXELINUX + MEMDISC intercept the BIOS calls and pretend to the 3rd party No Emulation image to be loading the data from a CD (but instead copy from memory). The driver would be a Real Mode driver and use some part of memory above 1Mb to store the data. I would expect this to be risky, especially if the No Emulation image writes over the same (above 1Mb) location. However maybe it would be possible to run the BIOS driver it in a debug/checking mode which checksumed its working area and the image and checked it before ea...
2014 Apr 29
2
Degraded performance when using GRE over tinc
Hi, In a setup where OpenVSwitch is used with GRE tunels on top of an interface provided by tinc, I'm experiencing significant performance degradation problems (from 100Mb/s down to 1Mb/s in the worst case) and I'm not sure how to fix this. The manifestation of the problem is, from the user point of view, iperf reports ~100Mb/s and rsync reports ~1Mb/s: $ iperf -c 91.224.149.132 ------------------------------------------------------------ Client connecting to 91.2...
2016 Jul 27
4
[PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
...b->pfn_limit, get_max_pfn()); > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > + hdr_len = sizeof(struct balloon_bmap_hdr); > + vb->bmap_hdr = kzalloc(hdr_len + vb->bmap_len, GFP_KERNEL); This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. How big was the pfn buffer before?
2016 Jul 27
4
[PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
...b->pfn_limit, get_max_pfn()); > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_PER_LONG) / > + BITS_PER_BYTE + 2 * sizeof(unsigned long); > + hdr_len = sizeof(struct balloon_bmap_hdr); > + vb->bmap_hdr = kzalloc(hdr_len + vb->bmap_len, GFP_KERNEL); This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. How big was the pfn buffer before?
2005 Jan 31
3
load balancing between two default gateways
Hi list gurus, long story short we have firewall machine which is the default gateway for our clients and firewall send traffic out to Internet via cisco router. On cisco we have two serial interfaces 1Mb and 2Mb. On firewall #route add default gw xxx.xxx.xx.xxx (for 2mb) #route add default gw xxx.xxx.xx.xxx (for 1mb) and the same rule for Imb link route packets via these two links. However I don''t know what kernel do when sending traffic via these two "default routes" however im...
2012 Oct 29
13
POLL: v2.2 to allow one mail over quota?
Currently if user is 1MB under quota and someone tries to deliver mail that is over 1MB, Dovecot rejects the mail. But smaller mails aren't rejected probably for days. So user might not even realize that they didn't receive one of the mails. Also having a user "almost over quota" is a rather strange state...
2007 Jan 31
5
Website down - Mongrel Log file issue...
I am new to Mongrel. We have a website that was created by someone using Ruby. The problem we are having is that the mongrel log file is shutting the site down when the log file gets to 1mb. Is there a way to configure the log file to cycle at a given size? What are my options to keep the site running? Thanks for your help!! Roy -------------- next part -------------- An HTML attachment was scrubbed... URL: http://rubyforge.org/pipermail/mongrel-users/attac...
2003 Aug 10
7
pxelinux - loading vmlinuz and initrd.gz
Greetings, Hopefully a quick question.. I have been experimenting with pxelinux and have noticed the following, when using initrd.gz - vmlinuz needs to exist 'tftpboot' directory, else I get an error from pxelinux. eg. kernel/vmlinuz - vmlinux also needs to exist in initrd.gz (in the same relative path eg. kernel/vmlinuz) else Linux is not booted. [I haven't
2016 Jul 28
0
[virtio-dev] Re: [PATCH v2 repost 4/7] virtio-balloon: speed up inflate/deflate process
> > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big. > > > How big was the pfn buffer before? > > > > Yes, it is if the max pfn is more than 32GB. > > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too > > small, and it's the main reason for bad perf...
2017 Nov 15
10
Re: [Qemu-devel] [qemu-img] support for XVA
...40 1970-01-01 01:00 Ref:175/00000010.checksum You can ignore the ova.xml and just use the "Ref:175" directory. Inside the XVA you'll fine one "Ref" directory for each virtual disk (ref number is different for each disk) Inside each Ref directory, you'll get tons of 1MB file, corrisponding to the RAW image. You have to merge these files in a single raw file with just an exception: numbers are not sequential. as you can see above, we have: 00000000, 00000001, 00000003 The 00000002 is missing, because it's totally blank. XenServer doesn't export any empty b...
2020 Oct 02
2
Memory mapping assumptions in RuntimeDyld
...on on z/OS, I see a failure in the AArch64 COFF test case. The test case has 3 sections. For each section, Memory::allocateMappedMemory() is called to reserve memory. If the distance between the pointers gets too large, then the test case fails. It can be reliable produced with a distance of 1MB between the pointers. An easy way to simulate this is to increase the number of memory bytes requested by 1MB (e.g. adding NumBytes += (1<<20); at begin of the method). Then the check if a relocation is correctly resolved fails. My current understanding is that the kernel is more or less fr...
2010 Jun 21
3
NFS performance - default rsize
...th the following setup. Clients : CentOS 5.5, kernel 2.6.18-194.el5 Server : Solaris 10 kernel Generic_142901-08 Reading a file (not cached) with dd : dd if=file1 of=/dev/null bs=1024k count=100 performance is around.. 700 kB/s ! /proc/mounts shows rsize has been negotiated to 1mB If we force rsize to a smaller value, 32kB, the problem goes away and we're back around 70/80 mB/s read performance. Wiresharks show something interesting in the first (slow) case: It seems that the NFS client is "waiting" between requests: ? 1473 11.756852 ? client.net ?n...
2006 Mar 02
7
Failing to understand getrusage()
...form "Use <this> profiling application" aren''t going to be applicable. I''m using BSD::Resource, which wraps getrusage(), and odd results from that led me to this C test. -------------- next part -------------- /* Call getrusage() before and after allocating 1MB of RAM, and see what the maxrss figure is */ #include <sys/types.h> #include <sys/time.h> #include <sys/resource.h> #include <stdio.h> int main(void) { struct rusage ru; char *ptr; int rc; rc = getrusage(RUSAGE_SELF, &ru);...
2018 Mar 18
3
Upgrade Centos 6 to Centos 7 32 Bits i686 architecture.
Hi , I am running Centos 6 on an old Acer S2000 PC 1Mb memory and i686 32 bits architecture. Question : Is there a possibility to upgrade to Centos 7 32 bits ? Regards , Ger van Dijck. -- Gemaakt met Opera's e-mailprogramma: http://www.opera.com/mail/