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From: | Erik Rull |
Subject: | [Qemu-devel] CPU Benchmark qemu-kvm 1.2.0 Win XP vs. Win 7 |
Date: | Fri, 04 Oct 2013 09:35:13 +0200 |
User-agent: | Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0 SeaMonkey/2.21 |
Hi all,when testing my first Windows 7 guest, I noticed, that the IRQ load / kernel time within the guest is quite high when having network access. I use the virtio drivers - the same version as in the Windows XP guests. There the kernel load is nearly only 50% of the Win7 load. Why? The provided guest hardware is exactly the same... Win XP was used without ACPI, Win7 requires it - so it is enabled on both commandlines. But I can't imagine that this causes such a huge performance drop.
Additionally I did some CPU benchmarking and the Win7 guest results in ~ 20% less in the hard/wetstone performance. Also the harddisk access is slower.
Any ideas what may cause the pure hardware performance degradation between these two guests when having the same qemu-kvm hardware parameters (beside the image file of course)? Any hints what to do to improve the performance for Win7 would be appreciated.
I would at least assume that the pure CPU performance would not drop significantly.
Thanks. Best regards, Erik
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