Re: [Qemu-devel] Windows slow boot: contractor wanted

[Brian Jackson]

On Friday 17 August 2012 07:36:42 Richard Davies wrote:

> Hi Avi,

>

> Thanks to you and several others for offering help. We will work with Avi

> at first, but are grateful for all the other offers of help. We have a

> number of other qemu-related projects which we'd be interested in getting

> done, and will get in touch with these names (and anyone else who comes

> forward) to see if any are of interest to you.

>

>

> This slow boot problem is intermittent and varys in how slow the boots are,

> but I managed to trigger it this morning with medium slow booting (5-10

> minutes) and link to the requested traces below.

>

> The host in question has 128GB RAM and dual AMD Opteron 6128 (16 cores

> total). It is running kernel 3.5.1 and qemu-kvm 1.1.1.

>

> In this morning's test, we have 3 guests, all booting Windows with 40GB RAM

> and 8 cores each (we have seen small VMs go slow as I originally said, but

> it is easier to trigger with big VMs):

>

> pid 15665: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \

> -vga cirrus -usbdevice tablet -vnc :99 -monitor stdio -hda test1.raw

> pid 15676: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \

> -vga cirrus -usbdevice tablet -vnc :98 -monitor stdio -hda test2.raw

> pid 15653: qemu-kvm -nodefaults -m 40960 -smp 8 -cpu host,hv_relaxed \

> -vga cirrus -usbdevice tablet -vnc :97 -monitor stdio -hda test3.raw

>

> We are running with hv_relaxed since this was suggested in the previous

> thread, but we see intermittent slow boots with and without this flag.

>

>

> All 3 VMs are booting slowly for most of the attached capture, which I

> started after confirming the slow boots and stopped as soon as the first of

> them (15665) had booted. In terms of visible symptoms, the VMs are showing

> the Windows boot progress bar, which is moving very slowly. In top, the VMs

> are at 400% CPU and their resident state size (RES) memory is slowly

> counting up until it reaches the full VM size, at which point they finish

> booting.

 

 

What memory options have you tried? (KSM, hugepages, -mem-preallocate)?

 

Is this only with 2008? (is that regular? R2?)

 

Have you tried any of the hyperv features/hints?

 

 

>

>

> Here are the trace files:

>

> http://users.org.uk/slow-win-boot-1/ps.txt (ps auxwwwf as root)

> http://users.org.uk/slow-win-boot-1/top.txt (top with 2 VMs still slow)

> http://users.org.uk/slow-win-boot-1/trace-console.txt (running trace-cmd)

> http://users.org.uk/slow-win-boot-1/trace.dat (the 1.7G trace data file)

> http://users.org.uk/slow-win-boot-1/trace-report.txt (the 4G trace report)

>

>

> Please let me know if there is anything else which I can provide?

>

> Thank you,

>

> Richard.

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