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Date: Wed, 8 Jun 2005 18:51:41 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Matthias Buelow <mkb@incubus.de>
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Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches)
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On Thu, May 26, 2005 at 02:15:54AM +0200, Matthias Buelow wrote:
>=20
> >>Others don't see this though, and in other cases it was *definitively
> >>proven* to be caused by the issue I mentioned.  I'll have to think
> >>more about what to try next..thanks for running the tests.
> >
> >Perhaps it's something SATA-related?
>=20
> Before restoring my 5.4 dumps after testing -current, I installed=20
> fedora3 linux just to verify it isn't somehow the hardware itself.  Ok,=
=20
> plain installation from CDs, kernel "2.6.9-1.667smp" (default=20
> installation kernel).  There was absolutely zero noticable lag or any=20
> effect on response time on X11 while untarring the same firefox source.=
=20
>  So there really seems to be something foul in FreeBSD in that regard.=20
>  And now for the dumps.. *sigh*.

In case you didn't see it, Jeff identified the probable cause of this
and developed the followng patch:

  http://www.chesapeake.net/~jroberson/flushbuf.diff

Does it work for you on 5.4?

Kris
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