From: Ryan Cumming <bodnar42@phalynx.dhs.org>
To: Adam Keys <akeys@post.cis.smu.edu>,
"Partha Narayanan" <partha@us.ibm.com>,
linux-kernel@vger.kernel.org
Cc: mingo@elte.hu
Subject: Re: Performance Results for Ingo's O(1)-scheduler
Date: Mon, 21 Jan 2002 20:16:28 -0800 [thread overview]
Message-ID: <200201212016.29055.bodnar42@phalynx.dhs.org> (raw)
In-Reply-To: <OF4544D2BC.16B7A12D-ON85256B48.00817250@raleigh.ibm.com> <20020122035540.ZUVU10199.rwcrmhc53.attbi.com@there>
In-Reply-To: <20020122035540.ZUVU10199.rwcrmhc53.attbi.com@there>
On January 21, 2002 19:55, Adam Keys wrote:
> I'm curious about the performance of the 4-way and 8-way systems. I know
> nothing about this benchmark. IIRC correctly it simulates chat clients
> connecting to a server and talking to each other. Is it a CPU, memory, or
> disk bound benchmark? What is causing the 4-way machines to be only 2x the
> performance of the 1-way machine and the 8-way machines to be < 3x the
> performance? Is the system bus the limiting factor on those machines?
Memory bus, lock contention, syncronization issues. SMP really isn't as
magical as people think after the overhead is taken in to account.
-Ryan
next prev parent reply other threads:[~2002-01-22 4:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-22 0:03 Performance Results for Ingo's O(1)-scheduler Partha Narayanan
2002-01-22 3:55 ` Adam Keys
2002-01-22 4:16 ` Ryan Cumming [this message]
2002-01-22 4:45 ` Rusty Russell
2002-01-22 5:28 ` Mark Hahn
[not found] <OF4544D2BC.16B7A12D-ON85256B48.00817250@raleigh.ibm.com >
2002-01-22 2:07 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2002-01-22 5:34 Dieter Nützel
[not found] <20020122053444.A30EE6DA96@mail.elte.hu>
2002-01-22 11:47 ` Ingo Molnar
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