Re: vmscan.c heuristic adjustment for smaller systems

William Lee Irwin III
2004-04-17T21:33:35Z

On Sat, Apr 17, 2004 at 12:38:55PM -0700, William Lee Irwin III wrote:
>> Marc Singer reported an issue where an embedded ARM system performed
>> poorly due to page replacement potentially prematurely replacing
>> mapped memory where there was very little mapped pagecache in use to
>> begin with.
>> Marc Singer has results where this is an improvement, and hopefully can
>> clarify as-needed. Help determining whether this policy change is an
>> improvement for a broader variety of systems would be appreciated.

On Sat, Apr 17, 2004 at 02:29:58PM -0700, Marc Singer wrote:
> I have some numbers to clarify the 'improvement'.
> Setup:
> ARM922 CPU, 200MHz, 32MiB RAM
> NFS mounted rootfs, tcp, hard, v3, 4K blocks
> Test application copies 41MiB file and prints the elapsed time
> The two scenarios differ only in the setting of /proc/sys/vm/swappiness.

This doesn't match your first response. Anyway, this one is gets
scrapped. I guess if swappiness solves it, then so much the better.

-- wli