James Foris wrote:
Nathan Scott wrote:
On Wed, Aug 11, 2004 at 03:39:44PM -0500, James Foris wrote:
I have been using XFS in both IRIX and Linux for many years now, and
overall I am
quite happy with it - recommend it to everyone, run it on my home
systems, etc.
But, recently I ran into something that I need some help in
understanding/explaining.
The title says it all, really, but the details follow below.
Hi there,
Before I forget completely, from talking to Christoph a few
days back he suggested that the problems you were seeing may
have been resolved by some fixes that have gone into the tree
in the last week or two (they certainly touch this area) - if
you could retry your tests and let us know whether you still
see this degredation on Linus' current -bk tree, that would
be much appreciated!
OK, I have run the sequence and it happened between 2.6.5 and 2.6.6-rc1.
From my test logs:
-----------------------
Linux petpc1 2.6.5 #1 SMP Sun Sep 12 17:16:05 CDT 2004 i686 i686 i386 GNU/Linux
/data/work3/multishot2
ext2
performance numbers include fsync : 6.690 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.978 sec; 64.176 MB/s 13.63 %
full
performance numbers include fsync : 0.188 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.118 sec; 63.067 MB/s 13.63 %
full
ext3
performance numbers include fsync : 6.541 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 9.015 sec; 56.794 MB/s 14.48 %
full
performance numbers include fsync : 0.003 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.815 sec; 65.513 MB/s 14.48 %
full
xfs
performance numbers include fsync : 6.539 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.740 sec; 66.147 MB/s 13.44 %
full
performance numbers include fsync : 0.000 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.278 sec; 70.353 MB/s 13.44 %
full
jfs
performance numbers include fsync : 6.517 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.016 sec; 63.871 MB/s 13.47 %
full
performance numbers include fsync : 0.000 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.455 sec; 68.677 MB/s 13.47 %
full
reiserfs
performance numbers include fsync : 7.412 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.798 sec; 58.195 MB/s 14.26 %
full
performance numbers include fsync : 0.004 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 50.301 sec; 10.179 MB/s 14.26
% full
Linux petpc1 2.6.6-rc1 #1 SMP Sun Sep 12 17:25:40 CDT 2004 i686 i686 i386
GNU/Linux
/data/work3/multishot2
ext2
performance numbers include fsync : 6.570 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.849 sec; 65.229 MB/s 13.63 %
full
performance numbers include fsync : 0.178 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.998 sec; 64.016 MB/s 13.63 %
full
ext3
performance numbers include fsync : 6.364 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.704 sec; 58.820 MB/s 14.48 %
full
performance numbers include fsync : 0.003 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.848 sec; 65.239 MB/s 14.48 %
full
xfs
performance numbers include fsync : 6.484 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.723 sec; 66.292 MB/s 13.44 %
full
performance numbers include fsync : 0.000 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.532 sec; 60.012 MB/s 13.44 %
full
jfs
performance numbers include fsync : 6.496 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.006 sec; 63.950 MB/s 13.47 %
full
performance numbers include fsync : 0.008 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 7.480 sec; 68.446 MB/s 13.47 %
full
reiserfs
performance numbers include fsync : 6.913 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 8.362 sec; 61.226 MB/s 14.26 %
full
performance numbers include fsync : 0.004 sec
wrote 512.000 MB in 16 writes, 32.000 MB/write, 128.183 sec; 3.994 MB/s 14.26
% full
It looks like there were 9 "bk" releases between 2.6.5 and 2.6.6-rc1. I will
continue to
try to narrow down exactly where the change happened (unless you have specific
versions
that you would like me to try first).
Thanks,
Jim Foris
Thanks again,
Jim Foris
thanks.
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