[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Disk iops performance scalability
Hi, Seeing a drop-off in iops when more vcpu's are added:- 3.8.2 kernel/xen-4.2.1/single domU/LVM backend/8GB RAM domU/2GB RAM dom0 dom0_max_vcpus=2 dom0_vcpus_pin domU 8 cores fio result 145k iops domU 10 cores fio result 99k iops domU 12 cores fio result 89k iops domU 14 cores fio result 81k iops ioping . -c 3 4096 bytes from . (ext4 /dev/xvda1): request=1 time=0.1 ms 4096 bytes from . (ext4 /dev/xvda1): request=2 time=0.7 ms 4096 bytes from . (ext4 /dev/xvda1): request=3 time=0.8 ms --- . (ext4 /dev/xvda1) ioping statistics --- 3 requests completed in 2002.0 ms, 1836 iops, 7.2 mb/s min/avg/max/mdev = 0.1/0.5/0.8/0.3 ms The initial ioping response is good, then a lot of latency with later ones. Any ideas ? Thanks John _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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