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. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users