Re: [PATCH] 2.4.20-rmap15b

Georg Nikodym (georgn@somanetworks.com)
Tue, 17 Dec 2002 16:54:56 -0500


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On Tue, 17 Dec 2002 19:50:04 -0200 (BRST)
Rik van Riel <riel@conectiva.com.br> wrote:

> On Mon, 16 Dec 2002, Georg Nikodym wrote:
>
> > Incidentally, a colleague claimed to have seem this behaviour on a
> > non-rmap 2.4.20.
>
> > 1. Known behaviour?
> > 2. Is there any data that I should be collecting that people are
> > interested in?
> > 3. Or should I just go back to 2.4.19-rmap14b (which did not trouble
> > me
> > in this way)?
>
> The suspect is the disk elevator, which isn't scheduling requests
> in a way to cause lower read latency, but is optimised more for
> throughput. This results in some pauses.
>
> I'll need to look into it.

I discovered after sending the above:

Dec 16 15:08:04 keller kernel: ieee1394: sbp2: sbp2util_allocate_request_packet
- no packets available!
Dec 16 15:08:04 keller kernel: ieee1394: sbp2: sbp2util_allocate_write_request_p
acket failed
Dec 16 15:08:34 keller kernel: ieee1394: sbp2: aborting sbp2 command

These messages correspond with the pauses... However, the ieee1394 code
has not changed in some time (as in many months).

-g

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