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Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores

From: Jan Kiszka
Subject: Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
Date: Tue, 06 Nov 2012 11:12:24 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 
On 2012-11-06 10:46, Dietmar Maurer wrote:
>>> This obviously breaks vhost when using multiple cores.
>>
>> With "obviously" you mean you already have a clue why?
>>
>> I'll try to reproduce.
> 
> No, sorry - just meant the performance regression is obvious (factor 20 to 
> 40).
> 

OK. Did you try to bisect over qemu-kvm as well? I'm wondering if there
was a version of vhost there that didn't have this regression but was
also using direct IRQ delivery inside the kernel.

Jan

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