Understand.
BTW, I appreciate LiS very much, as well as your many years of work supporting it.
--
Eugene
-----Original Message-----
From: Dave Grothe <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]; linux-streams@gsyc.escet.urjc.es
Sent: Fri, 02 Dec 2005 10:15:59 -0600
Subject: Re: [Linux-streams] LiS-2.18 performance ?
LiS does not wake up additional queue run threads until there are around a dozen queues to process in the list. It is not deemed to be worth the task wakeup time for lesser amounts. I did some performance testing and found that list lengths in that range were about optimal.
You can't do put/service processing from interrupt level because of having to "down" semaphores, which operation can only be performed from process level.
I am sure that Brian's Fast STREAMS has a far superior solution to these problems.
-- Dave
At 08:13 AM 12/2/2005, [EMAIL PROTECTED] wrote:
You can't do put/service processing from interrupt level because of having to "down" semaphores, which operation can only be performed from process level.
I am sure that Brian's Fast STREAMS has a far superior solution to these problems.
-- Dave
At 08:13 AM 12/2/2005, [EMAIL PROTECTED] wrote:
Hello,
I'm curious about people impressions about LiS-2.18 performance.
Is it better comparing to LiS-2.16.18 ?
Are there any known 2.18 issues that can be fixed to improve performance?
My understanding is that in LiS-2.18 most(all?) of the queue processing
is done by LiS kernel threads and queuerun is never executed from
the driver tasklet context. That may result, I guess, in excessive process
switching overhead and poorer performance.
I might be missing something, though.
The other thing I noticed when I ran my tests on a 4 processor system
is that only one LiS thread accumulated CPU time:
root 9574 1 0 Dec01 ? 00:02:27 [LiS-2.18.0:0] <-------
root 9575 1 0 Dec01 ? 00:00:01 [LiS-2.18.0:1]
root 9576 1 0 Dec01 ? 00:00:00 [LiS-2.18.0:2]
root 9577 1 0 Dec01 ? 00:00:00 [LiS-2.18.0:3]
Is it the way it's su pposed to be, or it's a bug?
I'd appreciate any comment/advices regarding performance issues on LiS-2.18.
--
Eugene
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