I've been trying out RHL6.2 [sic] on KVM 70. This has an ancient
2.2.14 kernel and generally dates from 1999/2000. However it does run
nicely in 16 MB of RAM which makes it useful for me because I want to
see what happens when we run 100s of KVM instances :-)
A few observations:
(1) IDE DMA seems to cause problems. I get lost interrupts and
general disk problems unless I boot the kernel with ide=nodma.
(2) The kernel sees the default rtl8139 NIC but cannot seem to get any
packets out of it. I had to switch to using ne2k_pci instead.
(3) Heavy console activity hangs the virtual machine. This is a
really weird and very annoying bug.
(a) Serial console (-serial stdio) _also_ hangs under heavy activity.
(b) At the point when the kernel hangs, the EIP is always at the
same place, seemingly in the __best_copy_from_user function in
the guest kernel.
(c) The KVM monitor is still responsive.
(d) (Now the strange bit ..) If I switch to the KVM monitor first
and run my load tests - it doesn't hang!
(e) However, qemu-kvm -nographic hangs under my load tests.
(f) Plain qemu 0.9.1 doesn't hang.
Rich.
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
Read my OCaml programming blog: http://camltastic.blogspot.com/
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