Re: [2.4.20-ck7] good compressed caching experience

Kimmo Sundqvist (rabbit80@mbnet.fi)
Tue, 27 May 2003 17:13:48 +0300


On Tuesday 27 May 2003 00:11, Con Kolivas wrote:
> On Tue, 27 May 2003 04:50, Kimmo Sundqvist wrote:

> > Just a warning... both systems have only ReiserFS partitions. Other FSes
> > might still get hurt.

> This is definitely the case! If you try out compressed caching with ck7
> please do not enable preempt if you are using ext2/3 or vfat.

Is this a problem in ext2/3, pre-empt implementation, compressed caching or
kernel in general?

I think I can still choose between compression methods, or can I? Which one
of them, on average, is the least CPU-intensive, and which one gives the best
compression ratio? I am also at loss how to interpret the percentages in
"cat /proc/comp_cache_stat".

For M$ Windows there was once a program called MagnaRAM97 that had a similar
idea, but I don't understand how it could report 2 to 3-fold compression
ratios. It always spontaneously rebooted the Pentium 133MHz after some
hours, so I uninstalled it.

Just take your time, but will we see a pre-empt safe (or better yet SMP safe)
version coming out anytime soon?

Compiling another 2.4.20-ck7 with 8kB pages and swap compression in the
background. I have now "mem=896M" to avoid the highmem boundary, even if it
wasn't necessary. Someone said somewhere that a 1GB system is faster without
highmem support, so I haven't compiled it in for a while.

-Kimmo S.
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