[libvirt] speeding up qemu core dumps

Hi All, I've had user reports of "libvirt limiting KVM core dumps". This isn't quite true since libvirt just uses the default migration speed defined in qemu's migration.c /* Migration speed throttling */ static int64_t max_throttle = (32 << 20); AFAIK, there's not much interest in changing the qemu default http://lists.nongnu.org/archive/html/qemu-devel/2011-02/msg01156.html I thought there were more discussions on the topic but can only find the above thread ATM. Do folks here have objections to increasing the migration speed prior to core dump? If not, any suggestions for a value? I set the migration speed to 1G in doCoreDump() prior to calling qemuMigrationToFile() with following improvement dumping a 4G guest 32MiB/s migration speed (qemu default): # time virsh dump --live test /tmp/dump Domain test dumped to /tmp/dump real 0m10.121s user 0m0.004s sys 0m0.004s 1GiB/s migration speed: # time virsh dump --live test /tmp/dump Domain test dumped to /tmp/dump real 0m3.745s user 0m0.004s sys 0m0.004s I suppose the same applies for save. Regards, Jim