>>>>> "Rob" == Rob Creecy <rcreecy@xxxxxxxxxx> writes:
Rob> This performance sounds great, and I would like to try to
Rob> duplicate it. I also have fibre disks, so the hardware should be
Rob> fine. I have some questions.
Rob> 1. What mkfs options did you use? You imply it doesn't matter
Rob> much, that the hardware and lvm stripe are more important.
Default values. mkfs.xfs extracts the stripe unit and stripe width
from the underlying volume.
Rob> 2. What benchmark shows the near 100MB/s bandwidth? What
Rob> performance should I expect from a simple dd if=junk
Rob> of=/dev/null bs=xxx, with xxx optimized for stripe width.
Rob> 3. What kind of streaming write performance did you get?
The box is a dual PIII/550 with 128 MB RAM, 8 x 10Krpm FC-AL disks
hanging off a QLA2200 controller. MD RAID0, 64K sunit.
lmdd was used for this test.
Write:
1 KB: 1073.7418 MB in 20.0818 secs, 53.4685 MB/sec
2 KB: 1073.7418 MB in 17.5326 secs, 61.2427 MB/sec
4 KB: 1073.7418 MB in 15.9696 secs, 67.2366 MB/sec
8 KB: 1073.7418 MB in 13.9967 secs, 76.7137 MB/sec
16 KB: 1073.7418 MB in 12.6960 secs, 84.5733 MB/sec
32 KB: 1073.7418 MB in 12.0093 secs, 89.4094 MB/sec
64 KB: 1073.7418 MB in 11.8023 secs, 90.9776 MB/sec
128 KB: 1073.7418 MB in 12.0789 secs, 88.8939 MB/sec
256 KB: 1073.7418 MB in 12.9357 secs, 83.0060 MB/sec
512 KB: 1073.7418 MB in 13.1607 secs, 81.5867 MB/sec
1024 KB: 1073.7418 MB in 13.1356 secs, 81.7430 MB/sec
Read:
1 KB: 1073.7418 MB in 15.3174 secs, 70.0994 MB/sec
2 KB: 1073.7418 MB in 12.5642 secs, 85.4602 MB/sec
4 KB: 1073.7418 MB in 11.7001 secs, 91.7724 MB/sec
8 KB: 1073.7418 MB in 11.9564 secs, 89.8047 MB/sec
16 KB: 1073.7418 MB in 12.5844 secs, 85.3230 MB/sec
32 KB: 1073.7418 MB in 12.4468 secs, 86.2663 MB/sec
64 KB: 1073.7418 MB in 12.4049 secs, 86.5577 MB/sec
128 KB: 1073.7418 MB in 12.3757 secs, 86.7620 MB/sec
256 KB: 1073.7418 MB in 13.2388 secs, 81.1059 MB/sec
512 KB: 1073.7418 MB in 14.6501 secs, 73.2925 MB/sec
1024 KB: 1073.7418 MB in 15.2380 secs, 70.4645 MB/sec
--
Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc.
mkp@xxxxxxxxxxxxx, http://www.linuxcare.com/
SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
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