https://bugzilla.kernel.org/show_bug.cgi?id=42755
Summary: KVM is being extremely slow on AMD Athlon64 4000+ Dual
Core 2.1GHz Brisbane
Product: Virtualization
Version: unspecified
Kernel Version: 3.2.2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
AssignedTo: virtualization_...@kernel-bugs.osdl.org
ReportedBy: sandik...@yandex.ru
Regression: No
Hello.
Kvm seems to be broken on AMD Athlon64 4000+ Dual Core 2.1GHz Brisbane. A
kernel build takes over
2 hours, compared to 15 minutes on the host. I'm running with virtio
for storage, and this does not seem to be related to IO. A simple test
with dd also demonstrates that the problem is cpu-ralated:
Host test:
dd if=/dev/zero of=/dev/null bs=1k count=8M
8388608+0 записей считано (read)
8388608+0 записей написано (write)
скопировано (copyed) 8589934592 байта (8,6 GB), 7,04456 c, 1,2 GB/c
This also does not seem to be a cpu bug, as both VirtualBox and VMware
work fine.
Vmware/Virtualbox test:
dd if=/dev/zero of=/dev/null bs=1k count=8M
8388608+0 записей считано (read)
8388608+0 записей написано (write)
скопировано (copyed) 8589934592 байта (8,6 GB), 5,02745 c, 1,7 GB/c
I've tried different kernels on host, between 2.6.22 and current git,
with the same results. The guest is running Gentoo Hardened kernel 3.2.2
, but I could try with a an other distro and a vanilla kernel
if required.
My kvm version is kvm 1.0
Help would be much appreciated.
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