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Re: [Qemu-devel] Xenoppix (KNOPPIX5.1.1 + Xen3.0.4 + QEMU/KVM + HTTP-FUS


From: Fabrice Bellard
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
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922 Fedora/1.7.12-1.3.1

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.




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