From: Gleb Natapov <gleb@redhat.com>
To: Peter Lieven <pl@dlh.net>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, vrozenfe@redhat.com
Subject: Re: [Qemu-devel] win7 bad i/o performance, high insn_emulation and exists
Date: Tue, 21 Feb 2012 13:00:57 +0200 [thread overview]
Message-ID: <20120221110057.GA27471@redhat.com> (raw)
In-Reply-To: <4F43790B.90603@dlh.net>
On Tue, Feb 21, 2012 at 11:59:23AM +0100, Peter Lieven wrote:
> On 21.02.2012 11:56, Gleb Natapov wrote:
> >On Tue, Feb 21, 2012 at 11:50:47AM +0100, Peter Lieven wrote:
> >>>I hope it will make Windows use TSC instead, but you can't be sure
> >>>about anything with Windows :(
> >>Whatever it does now it eates more CPU has almost equal
> >>number of exits and throughput is about the same (15MB/s).
> >>If pmtimer is at 0xb008 it still reads it like hell.
> >>
> >>I checked with bcedit /v that useplatformclock is set to "No".
> >Yeah, today I noticed that it is likely virtio drivers that hammer
> >on PM timer (at least rip of the instruction that access it is
> >very close to rip of the instruction that access virtio pio).
> >Vadim, Windows driver developer, is CCed.
> Ok, I will switch to IDE and e1000 to confirm this? Or does it not
> make sense?
>
It make perfect sense! Please try it.
--
Gleb.
next prev parent reply other threads:[~2012-02-21 11:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-20 18:17 [Qemu-devel] win7 bad i/o performance, high insn_emulation and exists Peter Lieven
2012-02-20 18:40 ` Gleb Natapov
2012-02-20 19:04 ` Gleb Natapov
2012-02-20 19:24 ` Peter Lieven
2012-02-20 19:59 ` Peter Lieven
2012-02-20 20:45 ` Gleb Natapov
2012-02-21 10:50 ` Peter Lieven
2012-02-21 10:56 ` Gleb Natapov
2012-02-21 10:59 ` Peter Lieven
2012-02-21 11:00 ` Gleb Natapov [this message]
2012-02-21 11:16 ` Peter Lieven
2012-02-21 11:46 ` Gleb Natapov
2012-02-21 12:05 ` Peter Lieven
2012-02-21 13:56 ` Vadim Rozenfeld
2012-02-21 14:10 ` Peter Lieven
2012-02-21 16:48 ` Vadim Rozenfeld
2012-02-21 18:21 ` Peter Lieven
2012-02-20 19:15 ` Peter Lieven
2012-02-20 20:42 ` Gleb Natapov
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