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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