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From: Anders <mail@flac.kalibalik.dk>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [4341] qemu: generate signals on tap I/O
Date: Tue, 06 May 2008 01:12:09 +0200	[thread overview]
Message-ID: <481F9449.6040602@flac.kalibalik.dk> (raw)
In-Reply-To: <481F8DE5.9040905@codemonkey.ws>

Anthony Liguori wrote:
> You're seeing improvement with normal QEMU?  Can you please post a 
> description of what you're seeing improve with SIGIO.  SIGIO should 
> really only slow things down.
>   

I found this issue in KVM. I have not timed in QEMU, but the issue 
seemed generic, so I posted it upstream.

My usecase was a new VNC connection delaying until the next timer tick 
(which is a really long time in some KVM configurations).

The improvement is from running the select() immediately, rather than 
waiting around for a timer to expire.

Thanks,
Anders.

  parent reply	other threads:[~2008-05-05 23:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-05 21:26 [Qemu-devel] [4341] qemu: generate signals on tap I/O Aurelien Jarno
2008-05-05 22:06 ` Anders
2008-05-05 22:15   ` Aurelien Jarno
2008-05-05 22:42     ` Anders
2008-05-05 22:44       ` Anthony Liguori
2008-05-05 22:49         ` Aurelien Jarno
2008-05-05 22:51           ` Aurelien Jarno
2008-05-05 22:57             ` Anthony Liguori
2008-05-05 23:00               ` Anthony Liguori
2008-05-05 23:12         ` Anders [this message]
2008-05-06  2:48           ` Anthony Liguori
2008-05-06  8:35             ` Anders
2008-05-05 22:50       ` Anthony Liguori
2008-05-05 22:43 ` Anthony Liguori

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