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Re: XFS - Performance Optimazation.

To: rcreecy@xxxxxxxxxx
Subject: Re: XFS - Performance Optimazation.
From: "Martin K. Petersen" <mkp@xxxxxxxxxxxxx>
Date: 25 Apr 2001 15:10:02 -0400
Cc: Steve Lord <lord@xxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <3AE71ABE.82C0FBC@census.gov>
Organization: Linuxcare, Inc.
References: <200104251515.f3PFFnb24856@jen.americas.sgi.com> <3AE71ABE.82C0FBC@census.gov>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.2 (Urania)
>>>>> "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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