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xen-users
[Xen-users] Poor disk performance in xen 3.1
Hi List,
I`m getting extremely poor disk performance with xen 3.1, here are some
results from hdparam -tT /dev/sda in Dom0:
20 Vms running (for few weeks):
Timing cached reads: 1472 MB in 2.00 seconds = 735.98 MB/sec
Timing buffered disk reads: 28 MB in 3.24 seconds = 8.65 MB/sec
All Vms stopped, xend stopped:
Timing cached reads: 1872 MB in 2.00 seconds = 936.35 MB/sec
Timing buffered disk reads: 38 MB in 3.47 seconds = 10.94 MB/sec
after reboot (same kernel, no VMs started, xend running)
Timing cached reads: 1804 MB in 2.00 seconds = 902.54 MB/sec
Timing buffered disk reads: 216 MB in 3.01 seconds = 71.82 MB/sec
after reboot (non-xen kernel)
Timing cached reads: 1810 MB in 2.00 seconds = 905.01 MB/sec
Timing buffered disk reads: 216 MB in 3.04 seconds = 71.08 MB/sec
after reboot in xen kernel + VMs start
Timing cached reads: 1876 MB in 2.00 seconds = 937.98 MB/sec
Timing buffered disk reads: 64 MB in 3.04 seconds = 21.04 MB/sec
After VM stop and xend stop
Timing cached reads: 1900 MB in 2.00 seconds = 950.28 MB/sec
Timing buffered disk reads: 60 MB in 3.09 seconds = 19.40 MB/sec
After 12 hours work of the VMs:
Timing cached reads: 1094 MB in 2.00 seconds = 546.26 MB/sec
Timing buffered disk reads: 68 MB in 3.64 seconds = 18.70 MB/sec
I could live with the poor performance in tests when VMs are running as 20 VMs
could make a lot of I/O, but whats with the performance when I stop all
DomUs? I get ~1/3 of the performance I get before starting DomUs and there
are no other services running on Dom0 that could make I/O.
Has anyone had such issues, what might cause this?
The server is:
2x xeon @2.8
6GB ECC ram
4x 500GB sata disks on a hpt 2210 raid controller in raid 5.
Xen 3.1 built from source.
Ubuntu feisty in dom0.
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