Re: SWAP: Linux far behind Solaris or I missed something (fwd)

Stephen C. Tweedie (
Fri, 4 Dec 1998 14:49:11 GMT


On Fri, 4 Dec 1998 10:41:15 +0000, Neil Conway
<> said:

>> (although the 2.1.130+my patch seems to work very well
>> with extremely high swap throughput)

> Since the poster didn't say otherwise, perhaps this test was performed
> with buffermem/pagecache.min_percent set to their default values, which
> IIRC add up to 13% of physical RAM (in fact that's PHYSICAL ram, not 13%
> of available RAM). So take a 1024MB machine, with (say) roughly 16MB
> used by the kernel and kernel-data. Then subtract 0.13*1024 (133MB !!)
> and you're left with a paltry 875MB or so. (This assumes that the
> poster had modified his kernel to handle the full 1024MB btw).

I know. That's why relying on fixed margins to ensure good
performance is wrong: the system really ought to be self-tuning.
We may yet get it right for 2.2: there are people working on this.


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