hi
scenario:
- host: 2.6.26, kvm-79, Intel Xeon E5420, Disk is a hardware RAID-10 (4
wd velociraptor's)
- host: /tmp is lvm volume with XFS mounted with option nobarriers
- host: kvm-img create -f qcow2 /tmp/10gb 10G
- host: kvm -drive fiel=/tmp/10gb,if=scsi,boot=on \
-monitor socktet:/var/run/kvm.socket \
-smp 1 -vnc :1
- guest: sudo -u nobody dd if=/dev/zero of=/tmp/fillit
while dd'ing in guest somtimes i can't connect to the monitor-socket. And
sometimes on the guest vnc-display there are the following messages
printed:
[ 1138.923666] sd 0:0:0:0: ABORT operation failed.
[ 1138.924186] sd 0:0:0:0: [sda] DEVICE RESET operation started
(messages above repeated a couple of times)
[ 1138.924845] target0:0:0: control msgout: c.
[ 1138.925561] target0:0:0: has been reset
[ 1138.926117] sd 0:0:0:0: DEVICE RESET operation complete.
[ 1138.926703] sd 0:0:0:0: M_REJECT received (0:0).
... and sometimes there are also kernel panics. in case of kernel panic
i see this on the host:
[1105705.188932] vcpu not ready for apic_round_robin
(repated many times)
there are fewer problems if:
- i do dd a second time (because the image space is already allocated?)
- if i give more io time on the host (aka ionice -c2 -n0 -p<pid>)
- i use if=ide , but throughput is really slow (1g data: guest=3.3MB/s
host=316MB/s)
this behaviour i've also seen on 2 other hosts (1 intel, 1 amd, mostly on
rsync'ing things)
what can i do to get reasonable throughput but no kernel warnings/panics?
- Thomas
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