performance issues: linux aic7xxx, 29160, Radion IFT-7200
Eric Dantan Rzewnicki
rzewnickie at rfa.org
Tue Mar 12 15:07:35 PST 2002
"Justin T. Gibbs" wrote:
> >Hello again,
> I wonder if for some reason we have disconnection disabled? I get much
> better performance than that talking to a plain old 10K RPM disk. Can
> you go into aic7xxx.c, search for ahc->user_discenable and print out the
> contents of that variable?
(not-patched, so this is version 6.2.4)
ahc->user_discenable = discenable;
same in 2.4.16 ( I guess that's the same version so that would make
sense, of course...)
after patching the 2.4.18 sources for aic7xxx 6.2.5 the file names in
drivers/scsi/aic7xxx/ are different. Which one should I be looking at
> Both drivers negotiate to the same values?
yes, with both 5.2.4 and 6.2.4 the raid and the system disk negotiate to
> >Is there something else I can do to try to get better performance with
> >the new driver?
> If I understood why the performance was bad, I'd tell you. 8-)
> Any chance you can rent a SCSI bus analyzer for a day and capture
> some traces?
umm, I'll check with the boss, but I doubt it. Where would a person rent
such a thing?
> >You made a distinction between sequential and non-sequential workloads.
> If you have multple mp3's being written or read from at the same time,
> this will be a non-sequential workload. If you are only doing one
> at a time, it will be a sequential workload.
Ok, so probably very few people would ever care only about sequential
performance? We will have up to 4 streams of current broadcasts writing
to disk and potentially 'many' users streaming via http or copying via
http or smb from the archive. And for a time, someone will be copying
the past archives off CDs onto the raid via a samba share.
Can hdparm be used to measure non-sequential performance? is there a way
to quantify this?
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