From:	 Ingo Molnar <mingo@elte.hu>
To:	 Linus Torvalds <torvalds@transmeta.com>
Subject: [patch] swap-speedup-2.4.3-B3
Date:	 Tue, 24 Apr 2001 07:44:45 +0200 (CEST)
Cc:	 Alan Cox <alan@lxorguk.ukuu.org.uk>,
	 Linux Kernel List <linux-kernel@vger.kernel.org>,
	 <linux-mm@kvack.org>, Marcelo Tosatti <marcelo@conectiva.com.br>,
	 Rik van Riel <riel@conectiva.com.br>,
	 Szabolcs Szakacsits <szaka@f-secure.com>


the latest swap-speedup patch can be found at:

  http://people.redhat.com/mingo/swap-speedup/swap-speedup-2.4.3-B3

(the patch is against 2.4.4-pre6 or 2.4.3-ac13.)

-B3 includes Marcelo's patch for another area that blocks unnecesserily on
locked swapcache pages: async swapcache readahead. Marcello did some tests
which shows that this fix brought some nice improvements too.

"make -j32 bzImage" using 128MB mem, 128MB swap, 4 CPUs:

  stock 2.4.3-ac13
  ----------------
  real    4m0.678s
  user    4m2.870s
  sys     0m38.920s

  swap-speedup-A2
  ---------------
  real    3m24.190s
  user    4m1.070s
  sys     0m31.950s

  swap-speedup-B3 (A2 + Marcelo's swapin-readahead non-blocking patch)
  ---------------
  real    3m7.410s
  user    4m0.940s
  sys     0m28.680s

ie. for this kernel compile test:

   swap-speedup-A2 is a 18% speedup relative to stock 2.4.3-ac13
   swap-speedup-B3 is a 28% speedup relative to stock 2.4.3-ac13

and the amount of CPU time spent in the kernel has been reduced
significantly as well.

I believe all the correctness and SMP-locking issues have been taken care
of in -B3 as well.

	Ingo

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