Re: [PATCH 0/11] Avoiding fragmentation with subzone groupings v26

[Andi Kleen]

Mel Gorman <mel@xxxxxxxxx> writes:
> 
> Our tests show that about 60-70% of physical memory can be allocated on
> a desktop after a few days uptime. In benchmarks and stress tests, we are
> finding that 80% of memory is available as contiguous blocks at the end of
> the test. To compare, a standard kernel was getting < 1% of memory as large
> pages on a desktop and about 8-12% of memory as large pages at the end of
> stress tests.

If you don't have a fixed limit on the unreclaimable memory you could
still get into a situation where all memory is fragmented and unreclaimable,
right?

It might be much harder to hit, but we have so many users that at least
a few will eventually.

> Performance tests are within 0.1% for kbuild on a number of test machines. aim9
> is usually within 1% 

1% is a lot.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/