On Tue, Feb 28, 2012 at 2:21 AM, Andriy Gapon <[email protected]> wrote: > on 28/02/2012 11:43 Wojciech Puchar said the following: >>>> +++ swap_pager.c 2012-02-25 13:19:51.000000000 +0100 >>>> @@ -119,7 +119,7 @@ >>>> * The 32-page limit is due to the radix code (kern/subr_blist.c). >>>> */ >>>> #ifndef MAX_PAGEOUT_CLUSTER >>>> -#define MAX_PAGEOUT_CLUSTER 16 >>>> +#define MAX_PAGEOUT_CLUSTER 256 >>>> #endif >>> [snip] >>>> but swap_pager.c patch seems not to work. i observe 64kB pageouts, no more. >>>> >>>> what is wrong in it? >>> >>> Could there be a problem because of what the MAX_PAGEOUT_CLUSTER comment >>> says? >> >> right. but still 32 pages is 128kB, but i see 64kB I/Os in systat/vmstat > > Right, but the comment says to not define MAX_PAGEOUT_CLUSTER to a value > greater > than 32, but you did that. So all bets could be off unless you examined the > code and know exactly what should happen in this case.
I suspect it might be DFLTPHYS that splits disk i/o into 64K blocks on the driver level. --Artem > > > -- > Andriy Gapon > _______________________________________________ > [email protected] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "[email protected]" _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
