From: Avi Kivity <avi@redhat.com>
To: Richard Davies <richard@arachsys.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org,
Rik van Riel <riel@redhat.com>
Subject: Re: Windows slow boot: contractor wanted
Date: Tue, 21 Aug 2012 12:00:03 +0300 [thread overview]
Message-ID: <50334E13.8020100@redhat.com> (raw)
In-Reply-To: <20120820135656.GA16676@alpha.arachsys.com>
On 08/20/2012 04:56 PM, Richard Davies wrote:
> We're running host kernel 3.5.1 and qemu-kvm 1.1.1.
>
> I hadn't though about it, but I agree this is related to cpu overcommit. The
> slow boots are intermittent (and infrequent) with cpu overcommit whereas I
> don't think it occurs without cpu overcommit.
>
> In addition, if there is a slow boot ongoing, and you kill some other VMs to
> reduce cpu overcommit then this will sometimes speed it up.
>
> I guess the question is why even with overcommit most boots are fine, but
> some small fraction then go slow?
Could be a bug. The scheduler and the spin-loop handling code fight
each other instead of working well.
Please provide snapshots of 'perf top' while a slow boot is in progress.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Richard Davies <richard@arachsys.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Windows slow boot: contractor wanted
Date: Tue, 21 Aug 2012 12:00:03 +0300 [thread overview]
Message-ID: <50334E13.8020100@redhat.com> (raw)
In-Reply-To: <20120820135656.GA16676@alpha.arachsys.com>
On 08/20/2012 04:56 PM, Richard Davies wrote:
> We're running host kernel 3.5.1 and qemu-kvm 1.1.1.
>
> I hadn't though about it, but I agree this is related to cpu overcommit. The
> slow boots are intermittent (and infrequent) with cpu overcommit whereas I
> don't think it occurs without cpu overcommit.
>
> In addition, if there is a slow boot ongoing, and you kill some other VMs to
> reduce cpu overcommit then this will sometimes speed it up.
>
> I guess the question is why even with overcommit most boots are fine, but
> some small fraction then go slow?
Could be a bug. The scheduler and the spin-loop handling code fight
each other instead of working well.
Please provide snapshots of 'perf top' while a slow boot is in progress.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-08-21 9:00 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 10:47 Windows slow boot: contractor wanted Richard Davies
2012-08-16 10:47 ` [Qemu-devel] " Richard Davies
2012-08-16 11:39 ` Avi Kivity
2012-08-16 11:39 ` [Qemu-devel] " Avi Kivity
2012-08-17 12:36 ` Richard Davies
2012-08-17 12:36 ` [Qemu-devel] " Richard Davies
2012-08-17 13:02 ` Robert Vineyard
2012-08-17 13:02 ` [Qemu-devel] " Robert Vineyard
2012-08-18 14:44 ` Richard Davies
2012-08-18 14:44 ` [Qemu-devel] " Richard Davies
2012-08-19 5:02 ` Brian Jackson
2012-08-19 5:02 ` [Qemu-devel] " Brian Jackson
2012-08-20 8:16 ` Richard Davies
2012-08-20 8:16 ` [Qemu-devel] " Richard Davies
2012-08-19 8:40 ` Avi Kivity
2012-08-19 8:40 ` [Qemu-devel] " Avi Kivity
2012-08-19 8:51 ` Richard Davies
2012-08-19 8:51 ` [Qemu-devel] " Richard Davies
2012-08-19 14:04 ` Avi Kivity
2012-08-19 14:04 ` [Qemu-devel] " Avi Kivity
2012-08-20 13:56 ` Richard Davies
2012-08-20 13:56 ` [Qemu-devel] " Richard Davies
2012-08-21 9:00 ` Avi Kivity [this message]
2012-08-21 9:00 ` Avi Kivity
2012-08-21 15:21 ` Richard Davies
2012-08-21 15:21 ` [Qemu-devel] " Richard Davies
2012-08-21 15:39 ` Troy Benjegerdes
2012-08-21 15:39 ` Troy Benjegerdes
2012-08-22 9:08 ` Avi Kivity
2012-08-22 9:08 ` [Qemu-devel] " Avi Kivity
2012-08-22 12:40 ` Richard Davies
2012-08-22 12:40 ` [Qemu-devel] " Richard Davies
2012-08-22 12:44 ` Avi Kivity
2012-08-22 12:44 ` [Qemu-devel] " Avi Kivity
2012-08-22 14:41 ` Richard Davies
2012-08-22 14:41 ` [Qemu-devel] " Richard Davies
2012-08-22 14:53 ` Avi Kivity
2012-08-22 14:53 ` [Qemu-devel] " Avi Kivity
2012-08-22 15:26 ` Richard Davies
2012-08-22 15:26 ` [Qemu-devel] " Richard Davies
2012-08-22 17:22 ` Troy Benjegerdes
2012-08-22 17:22 ` Troy Benjegerdes
2012-08-25 17:51 ` Richard Davies
2012-08-25 17:51 ` Richard Davies
2012-08-22 15:21 ` Rik van Riel
2012-08-22 15:21 ` [Qemu-devel] " Rik van Riel
2012-08-22 15:34 ` Richard Davies
2012-08-22 15:34 ` [Qemu-devel] " Richard Davies
2012-08-25 17:45 ` Richard Davies
2012-08-25 17:45 ` [Qemu-devel] " Richard Davies
2012-08-25 18:11 ` Rik van Riel
2012-08-25 18:11 ` [Qemu-devel] " Rik van Riel
2012-08-26 10:58 ` Richard Davies
2012-08-26 10:58 ` [Qemu-devel] " Richard Davies
2012-09-06 9:20 ` Richard Davies
2012-09-06 9:20 ` [Qemu-devel] " Richard Davies
2012-09-12 10:56 ` Windows VM slow boot Richard Davies
2012-09-12 10:56 ` [Qemu-devel] " Richard Davies
2012-09-12 10:56 ` Richard Davies
2012-09-12 12:25 ` Mel Gorman
2012-09-12 12:25 ` [Qemu-devel] " Mel Gorman
2012-09-12 12:25 ` Mel Gorman
2012-09-12 16:46 ` Richard Davies
2012-09-12 16:46 ` [Qemu-devel] " Richard Davies
2012-09-12 16:46 ` Richard Davies
2012-09-13 9:50 ` Mel Gorman
2012-09-13 9:50 ` [Qemu-devel] " Mel Gorman
2012-09-13 9:50 ` Mel Gorman
2012-09-13 19:47 ` [PATCH 1/2] Revert "mm: have order > 0 compaction start near a pageblock with free pages" Rik van Riel
2012-09-13 19:47 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:47 ` Rik van Riel
2012-09-13 19:48 ` [PATCH 2/2] make the compaction "skip ahead" logic robust Rik van Riel
2012-09-13 19:48 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:48 ` Rik van Riel
2012-09-13 19:54 ` [PATCH -v2 " Rik van Riel
2012-09-13 19:54 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:54 ` Rik van Riel
2012-09-15 15:55 ` Richard Davies
2012-09-15 15:55 ` [Qemu-devel] " Richard Davies
2012-09-15 15:55 ` Richard Davies
2012-09-16 19:12 ` Richard Davies
2012-09-16 19:12 ` [Qemu-devel] " Richard Davies
2012-09-17 12:26 ` Mel Gorman
2012-09-17 12:26 ` [Qemu-devel] " Mel Gorman
2012-09-18 8:14 ` Richard Davies
2012-09-18 8:14 ` [Qemu-devel] " Richard Davies
2012-09-18 11:21 ` Mel Gorman
2012-09-18 11:21 ` [Qemu-devel] " Mel Gorman
2012-09-18 11:21 ` Mel Gorman
2012-09-18 17:58 ` Richard Davies
2012-09-18 17:58 ` [Qemu-devel] " Richard Davies
2012-09-17 13:50 ` Rik van Riel
2012-09-17 13:50 ` [Qemu-devel] " Rik van Riel
2012-09-17 14:07 ` Mel Gorman
2012-09-17 14:07 ` [Qemu-devel] " Mel Gorman
2012-09-17 14:07 ` Mel Gorman
2012-08-16 14:10 ` Windows slow boot: contractor wanted Benoît Canet
2012-08-16 14:10 ` [Qemu-devel] " Benoît Canet
2012-08-16 15:53 ` Troy Benjegerdes
2012-09-18 15:12 ` Windows slow boot Michael Tokarev
2012-09-18 15:12 ` [Qemu-devel] " Michael Tokarev
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