Messages in this thread |  | | | Date | Fri, 5 Jun 1998 21:30:25 +0200 (MET DST) | | From | "Michael L. Galbraith" <> | | Subject | Re: Swap partition thrashing |
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On Fri, 5 Jun 1998, Riley Williams wrote:
> Hi Michael. > > > This I believe is a known problem which is being addressed by the > > vm magicians. It will get better when someone figures out how to > > solve the fragmentation issues.. and no sooner I think. > > Here's a summary of what's been reported so far... > > 1. Two drives, one partition on each, both pri=1, thrash badly. > (Original report). >
My setup is two partitions at same priority on seperate drives, and I have no thrashing.
> This does suggest a possible set of rules, but more reports are needed > to verify them. The rule-set suggested is as follows: > > 1. TWO OR MORE swap partitions. > > 2. TWO OR MORE of these SHARE the HIGHEST priority level. >
Mine are both at highest.
> 3. The ones that share the highest priority level are on DIFFERENT > drives, with not more than one on each drive involved.
That matches my setup.
> > To ocomplete the picture, I'd like to receive further reports, and > ESPECIALLY for either of the following conditions: > > A. Thrashing NOT occurring when the above conditions are met. > Please state your partition setup.
/dev/sda1 * 1 1 201 205808 6 DOS 16-bit >=32M /dev/sda2 202 202 802 615424 6 DOS 16-bit >=32M /dev/sda3 803 803 1003 205824 83 Linux native /dev/sdb1 1 1 70 71664 83 Linux native /dev/sdb2 71 71 100 30720 83 Linux native /dev/sdb3 101 101 1886 1828864 83 Linux native /dev/sdb4 1024 1887 2014 131072 82 Linux swap /dev/sdc1 1 1 1885 1930224 83 Linux native /dev/sdc2 1024 1886 2014 132096 82 Linux swap /dev/sdd1 1 1 65 66544 83 Linux native /dev/sdd2 66 66 1750 1725440 83 Linux native /dev/sdd3 1024 1751 1879 132096 83 Linux native
[root]:# swapon -s Filename Type Size Used Priority /dev/sdb4 partition 130748 0 1 /dev/sdc2 partition 130748 0 1
I suspect that the thrashing is low mem/high fragmentation related.
-Mike
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