Fabrice Toppi wrote:
Hi,
We use KVM 75 on Gentoo hosts with kernel 2.6.27.8 with a variety of
guests (Windows XP, 2000, 2003 & several Linux distributions) in a
production setup.
The hosts are Intel Xeon based. We use bridged networking with E1000
model inside of guests.
Recently, we began to have network problem (slowdowns, lags, timeouts)
on several guests. Inside those guests, we saw with tcpdump that there
were packets with a size well over MTU. On the host, tcpdump on the
guest tap did show packets of 1500 bytes and that's all.
For some of the guests (Debian based), changing the NIC model to rtl8139
instead of e1000 "fixed" the problem, but for others (Gentoo kernel
2.6.27.19) it didn't.
Would it be a glitch in the KVM code or a driver problem ? Does this
ring a bell to anyone ?
I'm not sure anymore but I think it's very similar to what I had here with
pre-78 (approx again, since it was quite some time ago) versions of kvm
compiled with older kernel headers (without appropriate if_tun.h definitions).
I'd say try to reproduce it with 0.11.0 kvm userspace compiled against
2.6.27+ kernel headers. But yet again: kvm-75 is quite old by now, so
it's difficult to remember all the details.
/mjt
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