Re: Linux Kernel Dump Summit 2005

[Andy Isaacson]

On Wed, Oct 12, 2005 at 12:07:31PM +0200, Pavel Machek wrote:
> On St 12-10-05 10:56:46, Felix Oxley wrote:
> > > See Jamie Lokier's description how to *never* slow down. 
> > Sorry, where is this?
> 
> Somewhere on the lkml, *long* ago. Basically idea is to have one
> thread doing writing to disk, and second thread doing compression. If
> no compressed pages are available, just write uncompressed ones. That
> way compression can only speed things up.

That's Message-ID: <20040327144945.GG21884@xxxxxxxxxxxxxxxxxx>, dated
2004-03-27 14:49:45.  (Oh look, sendmail encodes the date in the
Message-ID in exactly that format.)

This technique only works for DMA-capable IO -- PIO will make it suck --
but attempting to dump 32GB via PIO would be insane anyways, so...

-andy
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