From: Jens Axboe <axboe@suse.de>
To: markw@osdl.org
Cc: akpm@digeo.com, linux-kernel@vger.kernel.org, wli@holomorphy.com,
Mark Haverkamp <markh@osdl.org>
Subject: Re: OSDL DBT-2 AS vs. Deadline 2.5.68-mm2
Date: Wed, 7 May 2003 19:36:37 +0200 [thread overview]
Message-ID: <20030507173637.GQ823@suse.de> (raw)
In-Reply-To: <200305071659.h47GxmW22250@mail.osdl.org>
On Wed, May 07 2003, markw@osdl.org wrote:
> On 7 May, Jens Axboe wrote:
> > On Wed, May 07 2003, markw@osdl.org wrote:
> >> I've collected some data from STP to see if it's useful or if there's
> >> anything else that would be useful to collect. I've got some tests
> >> queued up for the newer patches, but I wanted to put out what I had so
> >> far.
> >>
> >>
> >> METRICS OVER LAST 20 MINUTES:
> >> --------------- -------- ----- ---- -------- -----------------------------------
> >> Kernel Elevator NOTPM CPU% Blocks/s URL
> >> --------------- -------- ----- ---- -------- -----------------------------------
> >> 2.5.68-mm2 as 1155 94.3 8940.2 http://khack.osdl.org/stp/271356/
> >> 2.5.68-mm2 deadline 1255 94.9 9598.7 http://khack.osdl.org/stp/271359/
> >>
> >> FUNCTIONS SORTED BY TICKS:
> >> -- ------------------------- ------- ------------------------- -------
> >> # as 2.5.68-mm2 ticks deadline 2.5.68-mm2 ticks
> >> -- ------------------------- ------- ------------------------- -------
> >> 1 default_idle 6103428 default_idle 5359025
> >> 2 bounce_copy_vec 86272 bounce_copy_vec 97696
> >> 3 schedule 63819 schedule 70114
> >> 4 __make_request 30397 __blk_queue_bounce 31167
> >> 5 __blk_queue_bounce 26962 scsi_request_fn 26623
> >> 6 scsi_request_fn 24845 __make_request 25012
> >
> > uhh nasty, you are spending a lot of time bouncing. How much RAM is in
> > the machine, and what is the scsi hba?
>
> The system has 4GB of memory and has a DECchip 21554 (aacraid) that the
> external drives are connected to. Mark Haverkamp is currently trying to
> address those bounce buffers.
aacraid actually looks sane enough. so you should just be able to set
host->highmem_io and it should work.
--
Jens Axboe
next prev parent reply other threads:[~2003-05-07 17:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 16:33 OSDL DBT-2 AS vs. Deadline 2.5.68-mm2 markw
2003-05-07 16:44 ` William Lee Irwin III
2003-05-07 16:47 ` Jens Axboe
2003-05-07 16:59 ` markw
2003-05-07 17:36 ` Jens Axboe [this message]
2003-05-07 17:39 ` Mark Haverkamp
2003-05-07 22:41 ` Zwane Mwaikambo
2003-05-07 16:59 ` Martin Josefsson
2003-05-07 17:32 ` markw
2003-05-08 1:41 ` Nick Piggin
2003-05-08 16:12 ` markw
2003-05-08 16:17 ` Jens Axboe
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