No one has any idea?
On Sun, Aug 10, 2008 at 8:21 PM, xming <[EMAIL PROTECTED]> wrote: > Hi all, > > After that I migrated my home sever from xen to kvm, I noticed very > bad I/O performance, > tried many combination versions/scsi-ide-virtio I got best by using > kernel mod. 70 with > userspace 69 and virtio. > > Now I have upgraded to 2.6.26.2 and kvm-72, and the performance has > dropped again. SO > I ran some combinations of the kernel/user versions and it seem that > kvm-69 is still > the performance winnner for me > > Short summary of the numbers: > > - kvm-72(k) + kvm-69(u) + virtio ~= 56MB > - 2.6.26.2(k) + kvm-69(u) + virtio ~= 48MB > - kvm-72(k) + kvm-72(u) + virtio ~= 10MB > - 2.6.26.2(k) + kvm-72(u) + virtio ~= 8MB > > My setup: > > - AMD Athlon(tm) X2 Dual Core Processor BE-2300 > - 2 GB DDR > - 2 SATA in RAID1, guests on lvm2 > - Gentoo, no crazy CFLAGS (CFLAGS="-O2 -march=k8 -pipe > -fomit-frame-pointer"), 32-bit PAE host and guests > - kernel 2.6.26.2 and 2.6.25.9 (where stated) > > On host: > > # hdparm -Tt /dev/sda > > /dev/sda: > Timing cached reads: 2046 MB in 2.00 seconds = 1023.79 MB/sec > Timing buffered disk reads: 230 MB in 3.01 seconds = 76.53 MB/sec > > > Numbers: > > module kvm-72/userspace KVM-72 > --------------------------------------------------- > > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1538 MB in 1.99 seconds = 773.09 MB/sec > Timing buffered disk reads: 38 MB in 3.07 seconds = 12.39 MB/sec > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1532 MB in 1.99 seconds = 770.10 MB/sec > Timing buffered disk reads: 26 MB in 3.18 seconds = 8.19 MB/sec > > ~ # time (dd if=/dev/vda of=/dev/null bs=`echo $(( 1024*1024 ))` > count=1024 && sync) > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB) copied, 103.673 s, 10.4 MB/s > > real 1m43.972s > user 0m0.009s > sys 0m3.804s > > > > module 2.6.26.2/userspace KVM-72 > ---------------------------------------------------- > > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1446 MB in 1.99 seconds = 727.57 MB/sec > Timing buffered disk reads: 26 MB in 3.15 seconds = 8.25 MB/sec > > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1506 MB in 1.99 seconds = 756.83 MB/sec > Timing buffered disk reads: 24 MB in 3.12 seconds = 7.70 MB/sec > > ~ # time (dd if=/dev/vda of=/dev/null bs=`echo $(( 1024*1024 ))` > count=1024 && sync) > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB) copied, 133.183 s, 8.1 MB/s > > real 2m13.467s > user 0m0.016s > sys 0m3.637s > > > module 2.6.26.2/userspace KVM-69 > ---------------------------------------------------- > > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1706 MB in 1.99 seconds = 858.19 MB/sec > Timing buffered disk reads: 124 MB in 3.06 seconds = 40.48 MB/sec > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1690 MB in 1.99 seconds = 849.42 MB/sec > Timing buffered disk reads: 152 MB in 3.06 seconds = 49.67 MB/sec > > ~ # time (dd if=/dev/vda of=/dev/null bs=`echo $(( 1024*1024 ))` > count=1024 && sync) > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB) copied, 22.7106 s, 47.3 MB/s > > real 0m22.950s > user 0m0.014s > sys 0m17.734s > > module KVM-72/userspace KVM-69 > ---------------------------------------------------- > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1732 MB in 1.99 seconds = 870.12 MB/sec > Timing buffered disk reads: 252 MB in 3.03 seconds = 83.08 MB/sec > ~ # hdparm -tT /dev/vda > > /dev/vda: > Timing cached reads: 1742 MB in 1.99 seconds = 875.01 MB/sec > Timing buffered disk reads: 334 MB in 3.03 seconds = 110.27 MB/sec > > ~ # time (dd if=/dev/vda of=/dev/null bs=`echo $(( 1024*1024 ))` > count=1024 && sync) > 1024+0 records in > 1024+0 records out > 1073741824 bytes (1.1 GB) copied, 19.1325 s, 56.1 MB/s > > real 0m19.310s > user 0m0.013s > sys 0m15.435s > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
