From:	 Andrew Morton <akpm@zip.com.au>
To:	 lkml <linux-kernel@vger.kernel.org>
Subject: low-latency patch for 2.4.15-pre5
Date:	 Fri, 16 Nov 2001 00:25:21 -0800

A low-latency scheduling patch for 2.4.15-pre4/pre5 is at

	http://www.zip.com.au/~akpm/linux/schedlat.html#downloads

This is a general retune, retest and review.  A couple of bugs which
have crept into the patch were fixed.  ext3 support is added. Certain
code paths which were introduced into the kernel in the 2.4.9-2.4.11
timeframe have been addressed.

On a single 850MHz PIII with 768 megs of RAM and 1G of swap the worst case
interrupt-to-activation scheduling latency is around 400 microseconds.
Latencies on SMP are up to 1000 microseconds.

These measurements are across extreme workloads - peak latency across an SMP
kernel build is 260 microseconds.

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