Messages in this thread | | | Date | Mon, 12 Nov 2001 23:56:42 +0100 | From | Frank de Lange <> | Subject | Re: Abysmal interactive performance on 2.4.linus |
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On Mon, Nov 12, 2001 at 03:05:56PM -0500, Jeff Garzik wrote: > Can you try 2.4.13ac6 (not 7/8), and 2.2.20, and post a comparison?
Here's the results from some tests I did:
2.2.20 ====== without filesystem activity no slowdowns observed time ls -al /usr/|sort -k 5 -n real 0m0.121s user 0m0.000s sys 0m0.090s
with filesystem activity on ext2 no slowdowns observed time ls -al /opt/|sort -k 5 -n real 0m0.079s user 0m0.010s sys 0m0.100s
2.4.13-ac5 ========== no slowdowns observed without filesystem activity time ls -al /usr/|sort -k 5 -n real 0m0.142s user 0m0.000s sys 0m0.000s
with filesystem activity on ext2 no slowdowns observed time ls -al /opt/|sort -k 5 -n real 0m0.022s user 0m0.020s sys 0m0.010s
with filesystem activity on reiserfs - it took 31 seconds to just open this small ( < 1 kb) text file (which resides in my home directory, on an ext2 filesystem) in vi... time ls -al /usr/|sort -k 5 -n real 0m6.136s user 0m0.020s sys 0m0.020s
2.4.15-pre4 =========== without filesystem activity no slowdowns observed time ls -al /usr/|sort -k 5 -n real 0m0.081s user 0m0.010s sys 0m0.010s
with filesystem activity on ext2 no slowdowns observed time ls -al /usr/|sort -k 5 -n real 0m0.146s user 0m0.000s sys 0m0.020s
with filesystem activity on reiserfs system behaviour erratic, some slowdowns time ls -al /opt|sort -k5 -n real 0m13.232s user 0m0.020s sys 0m0.010s
Seems that reiserfs is the common factor here, at least on my box. This is a 35 GB reiserfs filesystem, app 80% used, both large and small files.
As said in my previous message, the numbers themselves don't mean squat. It is the large delays (the fact that user+sys <<< real) which are the problem here.
Any other magic anyone wants me to perform? Hans, you reading this?
Cheers//Frank -- WWWWW _______________________ ## o o\ / Frank de Lange \ }# \| / \ ##---# _/ <Hacker for Hire> \ #### \ +31-320-252965 / \ lkml-frank@unternet.org / ------------------------- [ "Omnis enim res, quae dando non deficit, dum habetur et non datur, nondum habetur, quomodo habenda est." ] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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