Re: 2.1.91 swap performance: jerky.
mlord (mlord@pobox.com)
Fri, 27 Mar 1998 17:56:17 -0500
...
> > "cached" climbs to about 32MB of my 64MB total SDRAM,
> > and then a flurry of reverse activity kicks in..
> > the "cached" value drops again, as pages are read back
> > in and response returns to the previously comatose system.
> >
> > "cached" levels off again around 2-5MB, until I start some
> > new big application, whence the whole scenario repeats.
>
> Could you try to change in linux/mm/filemap.c:shrink_mmap() the
...
> /* Refuse to swap out all buffer pages */
> if ((buffermem >> PAGE_SHIFT) * 100 < (buffer_mem.min_percent * num_physpages))
> goto next;
> To
>
> /* Refuse to swap out all buffer pages */
> if (bh && (buffermem >> PAGE_SHIFT) * 100 < (buffer_mem.min_percent * num_physpages))
> goto next;
..
> Werner
Tried it. Less dramatic swings in swapping behaviour
than before, but still leaves more free memory than I'd
expect.. 4-5MB "free" at all times, despite continuous swapping.
(mind y'all, running four xboard's with "two machines" set
for each is a pretty heavy test of swapping..).
Either with or without, interactive response still "feels" okay,
considering the system load.
--
mlord@pobox.com
The Linux IDE guy
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