Hans,
readprofile shows an increases in calls to d_lookup(). There was also
some changes put in for the elevator I believe by Alan, Andi, and Co.
These may need some tuning. I can now post up to 645 asynch IO
requests at once between calls to run_task_queue(&tq_disk) before
2.3.99-Pre5 croaks and I get a deadlock in the block layer somewhere.
AIO performance is pretty sweet on 2.4 when it's working .... 2.2.15
is faster though for some reason. :-)
Jeff
Hans Reiser wrote:
>
> We seem to be seeing that both reiserfs and ext2 got slower in pre5, suggesting
> that something in VFS may need inspection.
>
> Since I usually am eager to learn of any performance losses in code I write, I
> have forwarded this to linux-kernel on the assumption that others are the same.
>
> Anyone know the reason for this offhand?
>
> Hans
>
> ------------------------------------------------------------------------
>
> Subject: Re: Yura, did we lose performance recently
> Date: Sat, 15 Apr 2000 13:58:28 +0400
> From: "Yury Yu. Rupasov" <yura@yura.polnet.botik.ru>
> To: Hans Reiser <hans@reiser.to>
> CC: "yura@namesys.botik.ru" <yura@namesys.botik.ru>,
> Chris Mason <mason@suse.com>
> References: <38F80E85.9180A3BF@reiser.to>
>
> Hans Reiser wrote:
> >
> > Did we lose performance in our most recent version? Can you compare the most
> > recent version with the benchmarks of the versions shortly after you added your
> > speedup? Or is it that a test condition changed? Or is it that I imagine that
> > we used to be faster at creates and writes?
> >
> > Please analyze this for your lazy boss.
> >
> > Hans
>
> Hi !
>
> Dbench results :
>
> NEW OLD
> linux-2.3.99-pre5 linux-2.3.99-pre3
> # dbench 5
> reiserfs-3.6.4 : 33.6730 MB/sec 32.6549 MB/sec
> ext2 : 30.2088 MB/sec 28.1817 MB/sec
>
> # dbench 10
> reiserfs-3.6.4 : 24.3463 MB/sec 25.4903 MB/sec
> ext2 : 19.0197 MB/sec 19.6588 MB/sec
>
> # dbench 20
> reiserfs-3.6.4 : 15.8885 MB/sec 17.5582 MB/sec
> ext2 : 12.8872 MB/sec 14.2822 MB/sec
>
> # dbench 50
> reiserfs-3.6.4 : 5.74655 MB/sec 5.80893 MB/sec
> ext2 : 4.98903 MB/sec 5.02426 MB/sec
>
> Dual Celeron-500, 128 MB RAM, 8 GB scsi HDD
>
> New results for pre5 are a bit worse for reiserfs and for ext2 too.
> Reiserfs faster in both cases.
>
> Best,
> Yura.
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