On Fri, 16 Jun 2000, Mike Galbraith wrote:
> On Wed, 14 Jun 2000, Alan Cox wrote:
> > Im interested to know if ac9/ac10 is the slow->fast change point
> ac5 is definately the breaking point. ac5 doesn't survive make
> -j30.. starts swinging it's VM machette at everything in sight.
> Reversing the VM changes to ac4 restores throughput to test1
> levels (11 minute build vs 21-26 minutes for everything
> Exact tested reversals below. FWIW, page aging doesn't seem to
> be the problem. I disabled that in ac17 and saw zero
> difference. (What may or not be a hint is that the /* Let
> shrink_mmap handle this swapout. */ bit in vmscan.c does make a
> consistent difference. Reverting that bit alone takes a minimum
> of 4 minutes off build time)
Interesting. Not delaying the swapout IO completely broke
performance under the tests I did here...
Delayed swapout vs. non-delayed swapouts was the difference
between 300 swapouts/s vs. 700 swapouts/s (under a load
with 400 swapins/s).
OTOH, I can imagine it being better if you have a very small
LRU cache, something like less than 1/2 MB.
-- The Internet is not a network of computers. It is a network of people. That is its real strength.
Wanna talk about the kernel? irc.openprojects.net / #kernelnewbies http://www.conectiva.com/ http://www.surriel.com/
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.org Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Jun 23 2000 - 21:00:13 EST