[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] domU is causing misaligned disk writes
On Tue, Apr 20, 2010 at 11:49:55AM +0300, Pasi Kärkkäinen spake thusly: > Are you using filesystems on normal partitions, or LVM in the domU? > I'm pretty sure this is a domU partitioning problem. Also: What changes in the view of the partitioning between domU and dom0? Wouldn't a partitioning error manifest itself in tests in the dom0 as well as in the domU? BTW: The dd from the last time in my last email finally finished: # dd if=/dev/zero of=/dev/xvdg1 bs=4096 count=3000000 3000000+0 records in 3000000+0 records out 12288000000 bytes (12 GB) copied, 734.714 seconds, 16.7 MB/s If I run that very same dd as above (the last test in my previous email) with the same partition setup again but this time from the dom0: # dd if=/dev/zero of=/dev/etherd/e6.1 bs=4096 count=3000000 3000000+0 records in 3000000+0 records out 12288000000 bytes (12 GB) copied, 107.352 seconds, 114 MB/s # /sbin/sfdisk -d /dev/etherd/e6.1 # partition table of /dev/etherd/e6.1 unit: sectors /dev/etherd/e6.1p1 : start= 64, size=566226926, Id=83 /dev/etherd/e6.1p2 : start= 0, size= 0, Id= 0 /dev/etherd/e6.1p3 : start= 0, size= 0, Id= 0 /dev/etherd/e6.1p4 : start= 0, size= 0, Id= 0 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 17350.80 0.60 275.60 22.40 72540.00 525.43 97.94 344.01 3.62 100.02 sdb 0.00 17374.80 1.20 256.00 28.00 74848.00 582.24 136.20 527.72 3.89 100.02 72MB/s and 74MB/s per disk in the stripe. Nice. Wish I could get that in a domU! -- Tracy Reed http://tracyreed.org Attachment:
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