Messages in this thread | | | Date | Wed, 24 Jul 2002 00:41:17 +0200 | From | Andrea Arcangeli <> | Subject | Re: 2.4.19rc2aa1 VM too aggressive? |
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On Tue, Jul 23, 2002 at 02:34:46PM -0700, Stephen Hemminger wrote: > On Tue, 2002-07-23 at 13:33, Andrea Arcangeli wrote: > > > some seldom swapout is ok, the strange thing are those small > > swapins/swapouts. I also assume it's writing using write(2), not with > > map_shared+msync. > > I am using ben's lahaise new AIO which effectively maps the pages in > before the i/o. Using normal I/O I don't see swapping, the cached peaks > at about .827028
sorry I thought you were using 2.4.19rc3aa1, -ac reintroduces a number of vm bugs with the rmap vm that I fixed some age ago, plus it underperformns in many areas, and about async-io I'm not shipping it. You should report this to Alan and Ben. I'm interested only about problems that can be reproduced with mainline and -aa, thanks.
> > can you try: > > > > echo 1000 >/proc/sys/vm/vm_mapped_ratio > > That file does not exist in 2.4.19rc3ac3
yes I misunderstood the kernel version.
> bash-2.05$ ls /proc/sys/vm > bdflush max_map_count min-readahead page-cluster > kswapd max-readahead overcommit_memory pagetable_cache > > > > I also wonder if you've quite some amount of mapped address space durign > > the benchmark. In such case there's no trivial way around it, the vm > > will constantly found tons of mapped address space, and it will trigger > > some swapouts, however the swapins shouldn't happen so fast in such > > case. > The AIO will pin some space, but the upper bound should be > NIO(16) * Record Size(64k) = 1 Meg > > > > In any case the sysctl will allow you to tune for your workload. > > > > Andrea >
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