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From: David Mosberger <davidm@napali.hpl.hp.com>
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Date: Fri, 19 Apr 2002 14:13:05 -0700
To: Rick Haines <rick@kuroyi.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: read latency (ia64)
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>>>>> On Thu, 18 Apr 2002 10:06:22 -0400, Rick Haines <rick@kuroyi.net> said:

  Rick> I have a Lion with 4 666mhz B3 stepping cpus and 4GB ram
  Rick> running Debian unstable with kernel 2.4.18 and the 020410 ia64
  Rick> patch (I have the same problem with 2.4.9-itanium-smp from the
  Rick> archive).

  Rick> I have a program that reads large files in increments of 81920
  Rick> blocks.  After about 9600 read calls I get about a dozen reads
  Rick> that take about 3 seconds each.  Does anyone have any ideas as
  Rick> to a cause/solution?  (I have 4 other threads working/possibly
  Rick> writing output at the same time, although in this case only 1
  Rick> of them would be active at the same time).  I am also running
  Rick> a program that callocs almost all my ram to make sure none of
  Rick> the file is cached.

I don't think anyone will be able to help you without a test case.
Do you have a minimal test case that reproduces the problem?

	--david
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