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From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: should ia64_spinlock_contention do backoff?
Date: Thu, 25 Mar 2004 22:28:02 +0000	[thread overview]
Message-ID: <16483.23794.749679.238180@napali.hpl.hp.com> (raw)
In-Reply-To: <200403251941.i2PJfrTH026392@napali.hpl.hp.com>

>>>>> On Fri, 26 Mar 2004 09:13:14 +1100, Keith Owens <kaos@sgi.com> said:

  Keith> [*] Extract of patched 2.4 out of line contention code.  The
  Keith> exponential backoff code came from early 2.4 kernels.

Yeah, I thought it looked similar to something I wrote a long time
ago! ;-)

Thanks for sharing the info.  I agree that it's difficult to find the
ideal trade-off between low-latency in the lightly contended case and
low bus utilization in the highly contended case.

Until someone finds data to the contrary, I'll assume that exponential
backoff isn't worth the trouble for the kernel (user-level is a very
different story, of course).

Thanks,

	--david

  parent reply	other threads:[~2004-03-25 22:28 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-25 19:41 should ia64_spinlock_contention do backoff? David Mosberger
2004-03-25 20:06 ` John Hawkes
2004-03-25 22:13 ` Keith Owens
2004-03-25 22:28 ` David Mosberger [this message]
2004-03-26 17:16 ` markw
2004-03-26 23:41 ` Chris Wedgwood
2004-03-26 23:44 ` David Mosberger
2004-03-27  0:14 ` Chen, Kenneth W
2004-03-28  2:37 ` John Hawkes
2004-03-28 19:23 ` Matthew Wilcox

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