Re: Results: pre6 vs pre6+zlatko's_patch vs pre5 vs arcavm13

[Linus Torvalds <torvalds@transmeta.com>]

On Sat, 9 Jan 1999, Steve Bergman wrote:
> 
> I ran the "image test" (loading 116 jpg images simultaneously) on the latest
> patches and got these results in 128MB (I end up with ~ 160MB in swap):
> 
> pre6+zlatko's_patch	2:35
> pre6			2:27
> pre5			1:58
> arcavm13		9:13

Can you run pre6+zlatko with just the mm/page_alloc.c one-liner reverted
to pre5? That is, take pre6+zlatko, and just change 

	try_to_free_pages(gfp_mask, freepages.high - nr_free_pages);

back to

	try_to_free_pages(gfp_mask, SWAP_CLUSTER_MAX);

That particular one-liner was almost certainly a mistake, it was done on
the mistaken assumption that the clustering problem was due to
insufficient write-time clustering - while zlatko found that it was
actually due to fragmentation in the swap area. With zlatkos patch, the
original SWAP_CLUSTER_MAX is probably better and almost certainly results
in smoother behaviour due to less extreme free_pages.. 

		Linus

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