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Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations |
Date: |
Mon, 25 Apr 2011 20:35:37 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Thu, Apr 14, 2011 at 09:14:35AM +0200, Jan Kiszka wrote:
> On 2011-04-13 22:16, Aurelien Jarno wrote:
> > On Mon, Apr 11, 2011 at 10:27:41PM +0200, Jan Kiszka wrote:
> >> These patches were posted before. They bring down the overhead of the
> >> io-thread mode for TCG here, specifically when emulating SMP.
> >>
> >> The major change in this version, besides rebasing, is the exclusion of
> >> KVM from the main loop polling optimization.
> >>
> >>
> >>
> >> Jan Kiszka (3):
> >> Do not drop global mutex for polled main loop runs
> >> Poll main loop after I/O events were received
> >> Do not kick vcpus in TCG mode
> >>
> >> cpus.c | 2 +-
> >> sysemu.h | 2 +-
> >> vl.c | 22 ++++++++++++++++------
> >> 3 files changed, 18 insertions(+), 8 deletions(-)
> >>
> >
> > Thanks for working on improving the io-thread with TCG. Your patches
> > make sense, but they don't seems to fix the slowdown observed when
> > enabling the io-thread. Well maybe they were not supposed to. This is
> > for example the results of netperf between guest and host using virtio:
> >
> > no io-thread 122 MB/s
> > io-thread 97 MB/s
> > io-thread + patches 98 MB/s
> >
>
> Can you capture ftraces of io-thread enabled & disabled runs? They just
> need to cover a hand full of frames.
>
>From what I have been able to get from the ftraces documentation, it's
possible multiple tracers. Which tracers would you like to use there?
The best would be a set of command lines to run.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
- [Qemu-devel] [PATCH v2 0/3] io-thread optimizations, Jan Kiszka, 2011/04/11
- [Qemu-devel] [PATCH v2 3/3] Do not kick vcpus in TCG mode, Jan Kiszka, 2011/04/11
- [Qemu-devel] [PATCH v2 2/3] Poll main loop after I/O events were received, Jan Kiszka, 2011/04/11
- [Qemu-devel] [PATCH v2 1/3] Do not drop global mutex for polled main loop runs, Jan Kiszka, 2011/04/11
- Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations, Paolo Bonzini, 2011/04/12
- Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations, Aurelien Jarno, 2011/04/13
- Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations,
Aurelien Jarno <=
- Re: [Qemu-devel] [PATCH v2 0/3] io-thread optimizations, Jan Kiszka, 2011/04/26