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lmdd performance results XFS vs. Ext2

To: linux-xfs@xxxxxxxxxxx
Subject: lmdd performance results XFS vs. Ext2
From: Rajagopal Ananthanarayanan <ananth@xxxxxxx>
Date: Wed, 07 Jun 2000 18:49:14 -0700
Sender: owner-linux-xfs@xxxxxxxxxxx
Results of write performance tests:
----------------------------------
 
Sequential write using lmdd, file size is ~209MB on a 2 CPU system with
total memory of 64M. The experiment is run over varying write-size from
1K to 1024K, 3 times for each block-size. This shows
 
1. Ext2 is well tuned (hardly any variation in 3 runs of each blocksize)!
2. XFS is sometimes faster than ext2 by upto ~8% [see best of ext2 & XFS for
      blocksize = 128K]
3. XFS is significantly slower for smaller block sizes; obviously,
        this will get a serious investigation.
 
In results not shown here, I've tried changing the max_bomb_segments
for the elevator. If that's made 128 (from default of 4), XFS shows
a larger improvement than ext2 (and hence faster in absolute comparison)
when lmdd was run with an 80M file ...
 
 
 
 
=========     EXT2     ==============   ==========    XFS   =================
 
--------- bs 1k ---------------------   --------- bs 1k ---------------------
209 MB in 25.8872 secs, 8.1011 MB/sec   209 MB in 66.8429 secs, 3.1374 MB/sec
209 MB in 26.0768 secs, 8.0422 MB/sec   209 MB in 63.9422 secs, 3.2798 MB/sec
209 MB in 25.8838 secs, 8.1022 MB/sec   209 MB in 72.2050 secs, 2.9044 MB/sec
--------- bs 2k ---------------------   --------- bs 2k ---------------------
209 MB in 25.9659 secs, 8.0766 MB/sec   209 MB in 73.4797 secs, 2.8541 MB/sec
209 MB in 25.9699 secs, 8.0753 MB/sec   209 MB in 71.7631 secs, 2.9223 MB/sec
209 MB in 25.9524 secs, 8.0808 MB/sec   209 MB in 68.3827 secs, 3.0668 MB/sec
--------- bs 4k ---------------------   --------- bs 4k ---------------------
209 MB in 25.8631 secs, 8.1087 MB/sec   209 MB in 25.9783 secs, 8.0727 MB/sec
209 MB in 25.9394 secs, 8.0848 MB/sec   209 MB in 26.0063 secs, 8.0640 MB/sec
209 MB in 25.9258 secs, 8.0890 MB/sec   209 MB in 25.9974 secs, 8.0668 MB/sec
--------- bs 8k ---------------------   --------- bs 8k ---------------------
209 MB in 25.9280 secs, 8.0884 MB/sec   209 MB in 26.2227 secs, 7.9975 MB/sec
209 MB in 25.9461 secs, 8.0827 MB/sec   209 MB in 26.0199 secs, 8.0598 MB/sec
209 MB in 25.9381 secs, 8.0852 MB/sec   209 MB in 25.7873 secs, 8.1325 MB/sec
--------- bs 16k ---------------------  --------- bs 16k ---------------------
209 MB in 25.9254 secs, 8.0892 MB/sec   209 MB in 25.9637 secs, 8.0773 MB/sec
209 MB in 25.9548 secs, 8.0800 MB/sec   209 MB in 25.9407 secs, 8.0844 MB/sec
209 MB in 25.9402 secs, 8.0846 MB/sec   209 MB in 25.6131 secs, 8.1878 MB/sec
--------- bs 32k ---------------------  --------- bs 32k ---------------------
209 MB in 25.9289 secs, 8.0881 MB/sec   209 MB in 26.2230 secs, 7.9974 MB/sec
209 MB in 25.9363 secs, 8.0858 MB/sec   209 MB in 26.3995 secs, 7.9439 MB/sec
209 MB in 25.9649 secs, 8.0769 MB/sec   209 MB in 26.0111 secs, 8.0625 MB/sec
--------- bs 64k ---------------------  --------- bs 64k ---------------------
209 MB in 25.9703 secs, 8.0752 MB/sec   209 MB in 25.9666 secs, 8.0763 MB/sec
209 MB in 25.9454 secs, 8.0829 MB/sec   209 MB in 25.7235 secs, 8.1527 MB/sec
209 MB in 25.8699 secs, 8.1065 MB/sec   209 MB in 25.8677 secs, 8.1072 MB/sec
--------- bs 128k --------------------  --------- bs 128k --------------------
209 MB in 25.9687 secs, 8.0757 MB/sec   209 MB in 25.7309 secs, 8.1503 MB/sec
209 MB in 25.9388 secs, 8.0850 MB/sec   209 MB in 26.1500 secs, 8.0197 MB/sec
209 MB in 25.8078 secs, 8.1260 MB/sec   209 MB in 23.9588 secs, 8.7531 MB/sec
--------- bs 256k --------------------  --------- bs 256k --------------------
209 MB in 25.9597 secs, 8.0785 MB/sec   209 MB in 24.2083 secs, 8.6629 MB/sec
209 MB in 25.9346 secs, 8.0863 MB/sec   209 MB in 26.2000 secs, 8.0044 MB/sec
209 MB in 25.9656 secs, 8.0767 MB/sec   209 MB in 25.4935 secs, 8.2262 MB/sec
--------- bs 512k --------------------  --------- bs 512k --------------------
209 MB in 25.9436 secs, 8.0835 MB/sec   209 MB in 25.0051 secs, 8.3869 MB/sec
209 MB in 26.0026 secs, 8.0652 MB/sec   209 MB in 25.3881 secs, 8.2604 MB/sec
209 MB in 25.9865 secs, 8.0702 MB/sec   209 MB in 25.9335 secs, 8.0867 MB/sec
--------- bs 1024k -------------------  --------- bs 1024k -------------------
209 MB in 25.9667 secs, 8.0763 MB/sec   209 MB in 26.1679 secs, 8.0142 MB/sec
209 MB in 25.9906 secs, 8.0689 MB/sec   209 MB in 25.9283 secs, 8.0883 MB/sec
209 MB in 25.9843 secs, 8.0709 MB/sec   209 MB in 24.9323 secs, 8.4114 MB/sec
--------------------------------------  --------------------------------------  
-- 
--------------------------------------------------------------------------
Rajagopal Ananthanarayanan ("ananth")
Member Technical Staff, SGI.
--------------------------------------------------------------------------

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