Thanks Jeff, anyone on the list know what code/author is the reason why Jeff is
seeing more calls to d_lookup?
Hans
"Jeff V. Merkey" wrote:
>
> 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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This archive was generated by hypermail 2b29 : Sun Apr 23 2000 - 21:00:12 EST