From: G. David Butler gdb@dbSystems.com
Subject: [9fans] DPT PM2041W observations
Date: Mon, 12 Jan 1998 13:58:43 -0600 [thread overview]
Message-ID: <19980112195843.tVkRS5jUDDmzmwTbj5h4GgHfziQ5pOCxAiRPEkc49sU@z> (raw)
>If the answer to that is "yes, with Tag Queueing", then I
>need some kind soul to help me get that to happen on the
>DPT adapter. (The 154x can't do that.) None of the
>documentation or source I have enable that feature.
I found and read the relevant parts of the SCSI-2 spec.
I now have tag queueing working. I also found the DPO flag
which helps both cards. Now the 154x does 1460MB/s (2% isn't
much, but anything helps.)
With tag queueing and 4 outstanding commands the DPT now gets
1370MB/s up from 1260MB/s. At 8 outstanding commands it only
gets 1310MB/s. At 2 outstanding commands it gets 1430MB/s.
So why does this 4th generation card with tag queueing support
run slower than the 1st generation design that is over 10 years
old?
David Butler
gdb@dbSystems.com
next reply other threads:[~1998-01-12 19:58 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-01-12 19:58 G.David [this message]
-- strict thread matches above, loose matches on Subject: below --
1998-01-14 22:56 Mark
1998-01-14 14:57 G.David
1998-01-12 23:18 G.David
1998-01-12 23:17 Eric
1998-01-12 20:52 G.David
1998-01-12 20:38 Eric
1998-01-12 0:19 G.David
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