From: Avi Kivity <avi@redhat.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: ben@iagu.net, KVM list <kvm@vger.kernel.org>
Subject: Re: KVM lock contention on 48 core AMD machine
Date: Mon, 21 Mar 2011 20:14:39 +0200 [thread overview]
Message-ID: <4D87958F.30104@redhat.com> (raw)
In-Reply-To: <1300727545.2884.513.camel@edumazet-laptop>
On 03/21/2011 07:12 PM, Eric Dumazet wrote:
> Le lundi 21 mars 2011 à 19:02 +0200, Avi Kivity a écrit :
>
> > Any ideas on how to fix it? We could pre-allocate IDs and batch them in
> > per-cpu caches, but it seems like a lot of work.
> >
>
> Hmm, I dont know what syscalls kvm do, but even a timer_gettime() has to
> lock this idr_lock.
It's qemu playing with posix timers, nothing to do with kvm per se.
> Sounds crazy, and should be fixed in kernel code, not kvm ;)
>
Oh yes, I couldn't fix it in kvm if I wanted to (and I don't want to).
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2011-03-21 18:14 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-18 12:02 KVM lock contention on 48 core AMD machine Ben Nagy
2011-03-18 12:30 ` Joerg Roedel
2011-03-19 4:45 ` Ben Nagy
2011-03-21 9:50 ` Avi Kivity
2011-03-21 11:43 ` Ben Nagy
2011-03-21 13:41 ` Ben Nagy
2011-03-21 13:53 ` Avi Kivity
[not found] ` <AANLkTikWQS281kTtJ32-qo5U+w_BAak7qUwVhUQgOxxv@mail.gmail.com>
2011-03-21 15:50 ` Avi Kivity
2011-03-21 16:16 ` Ben Nagy
2011-03-21 16:33 ` Avi Kivity
2011-03-21 16:54 ` Eric Dumazet
2011-03-21 17:02 ` Avi Kivity
2011-03-21 17:12 ` Eric Dumazet
2011-03-21 18:12 ` Ben Nagy
2011-03-21 22:27 ` [RFC] posix-timers: RCU conversion Eric Dumazet
2011-03-22 7:09 ` [PATCH] " Eric Dumazet
2011-03-22 8:59 ` Ben Nagy
2011-03-22 10:35 ` Avi Kivity
2011-03-22 10:35 ` Avi Kivity
2011-04-04 3:30 ` Ben Nagy
2011-04-04 7:18 ` Avi Kivity
2011-04-04 7:18 ` Avi Kivity
2011-04-05 7:49 ` Peter Zijlstra
2011-04-05 8:16 ` Avi Kivity
2011-04-05 8:16 ` Avi Kivity
2011-04-05 8:48 ` Peter Zijlstra
2011-04-05 8:56 ` Avi Kivity
2011-04-05 8:56 ` Avi Kivity
2011-04-05 9:03 ` Peter Zijlstra
2011-04-05 9:08 ` Avi Kivity
2011-04-05 9:08 ` Avi Kivity
2011-04-05 9:50 ` Ben Nagy
2011-04-05 8:56 ` Mike Galbraith
2011-04-03 16:54 ` Eric Dumazet
2011-04-04 18:08 ` john stultz
2011-04-04 19:47 ` Eric Dumazet
2011-04-05 14:48 ` Oleg Nesterov
2011-04-05 15:18 ` [PATCH v2] " Eric Dumazet
2011-04-05 15:43 ` Oleg Nesterov
2011-05-16 15:10 ` Avi Kivity
2011-05-16 15:30 ` Eric Dumazet
2011-04-08 18:28 ` [PATCH] " Paul E. McKenney
2011-03-21 18:14 ` Avi Kivity [this message]
2011-03-21 18:48 ` KVM lock contention on 48 core AMD machine Michael Tokarev
2011-03-21 18:53 ` Avi Kivity
2011-03-18 12:44 ` Stefan Hajnoczi
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