在 2013-7-17 PM11:37，"Valerio Pachera" <sirio81 at gmail.com>写道： > > Here I am with a new performance test with Sheepdog 0.6.0_127_g085568a. > I don't understand the reason, but write speed with cache enabled is > the same as without cache. > > The host where I'm running the guest has this configuration: > sheep -w size=20000 /mnt/sheep/meta/,/mnt/sheep/dsk02 > > /dev/sda3 on /mnt/sheep/meta type xfs (rw,relatime,attr2,delaylog,noquota) > /dev/sdb1 on /mnt/sheep/dsk02 type xfs (rw,relatime,attr2,delaylog,noquota) > > sda is and ssd disk! > > The guest > qemu-system-x86_64 -name backup -enable-kvm -drive > file=sheepdog:backup,cache=writeback -drive > file=sheepdog:backup_data,cache=writeback ... > > dd if=/dev/zero of=c1 bs=1M count=512 oflag=sync > 512+0 record dentro > 512+0 record fuori > 536870912 byte (537 MB) copiati, 63,3792 s, 8,5 MB/s > may you try it on you host too？oflag=sync is always slow. try oflag=direct instead > I'm writing into sheepdog:backup_data (1T), also formatted with xfs. > > The other two hosts have almost the same configuration: > sheep -w size=20000 /mnt/sheep/dsk01,/mnt/sheep/dsk01/obj,/mnt/sheep/dsk02 > > /dev/vg00/sheepdog /mnt/sheep/dsk01 xfs > defaults,noatime 0 2 > /dev/sdb1 /mnt/sheep/dsk02 xfs defaults,noatime 0 2 > > No ssd here. > The performance is exactly the same. > -- > sheepdog-users mailing lists > sheepdog-users at lists.wpkg.org > http://lists.wpkg.org/mailman/listinfo/sheepdog-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.wpkg.org/pipermail/sheepdog-users/attachments/20130717/61189121/attachment.html> |