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Message-ID: <20121016075122.GA25824@schottelius.org> Date: Tue, 16 Oct 2012 09:51:22 +0200 From: Nico Schottelius <nico-kernel20121016@...ottelius.org> To: LKML <linux-kernel@...r.kernel.org> Subject: Very bad performance on Qemu/KVM Good morning LKML, I see extremely slow virtual machines running on qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64 on Centos 6.3 with Linux 2.6.32-279.5.2.el6.x86_64 on a 64 core machine using AMD Opteron(TM) Processor 6276 (dell r815). The guests are Centos 6.3, Linux 2.6.32-220.13.1.el6.x86_64. The disk images reside on local storage, ext4 filesystem. I checked that kvm is loaded and enabled. I changed -drive to use if=virtio, -net to use model=virtio. >From the processes running it seems that cpu performance is the bottleneck. I added -cpu host to skip the emulation, but this did not fix the issue. Comparing the performance to qemu running on a xenserver, performance is at most half of it. Does anyone of you have a good pointer how to debug this further or are there any known issues with the given setup? I'm happy for every pointer I get, as there seems to be no easy to spot issue. Cheers, Nico -- PGP key: 7ED9 F7D3 6B10 81D7 0EC5 5C09 D7DC C8E4 3187 7DF0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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