From: Fabrice Bellard <fabrice@bellard.org>
To: k.suzaki@aist.go.jp
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Xenoppix (KNOPPIX5.1.1 + Xen3.0.4 + QEMU/KVM + HTTP-FUSE) is released
Date: Fri, 09 Feb 2007 15:13:41 +0100 [thread overview]
Message-ID: <45CC8195.1030404@bellard.org> (raw)
In-Reply-To: <20070209.202151.55858230.k.suzaki@aist.go.jp>
Kuniyasu Suzaki wrote:
> [...]
> >>2) For best performances with kqemu, it is better to use Linux 2.4 as
> >>guest OS (I know this is far from acceptable, but it can help some
> >>people to get better performance !).
>
> Please tell me the reason why Linux 2.4 shows better performance, if
> you have time. Does the difference of clock tick cause the problem?
The Linux 2.6 kernel has more code running with the interrupts disabled
than the 2.4 one. kqemu interprets the x86 code when the interrupts are
disabled, so it is very slow in this case.
A potential solution I am investigating is to use the new
paravirtualization API of the kernel versions >= 2.6.20.
Regards,
Fabrice.
next prev parent reply other threads:[~2007-02-09 14:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-09 10:49 [Qemu-devel] Xenoppix (KNOPPIX5.1.1 + Xen3.0.4 + QEMU/KVM + HTTP-FUSE) is released Kuniyasu Suzaki
2007-02-09 10:43 ` Fabrice Bellard
2007-02-09 11:21 ` Kuniyasu Suzaki
2007-02-09 14:13 ` Fabrice Bellard [this message]
2007-02-09 17:32 ` Jens Axboe
2007-02-09 10:59 ` Ricardo Almeida
2007-02-09 11:27 ` Kuniyasu Suzaki
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