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SubjectRe: No, really, stop trying to delete slab until you've finished making slub perform as well
KOSAKI Motohiro wrote:

>> Can you quantify the difference?
>
> machine spec:
> CPU: IA64 x 8
> MEM: 8G (4G x2node)

16k or 64k page size?

> procs -----------memory---------- ---swap-- -----io---- --system--
-----cpu------
> r b swpd free buff cache si so bi bo in cs us sy id wa st
> 2 0 0 3223168 6016 38336 0 0 0 0 3181 4314 0 15 85 0 0
> 2039 2 0 2022144 6016 38336 0 0 0 0 2364 13622 0 49 51 0 0
> 634 0 0 2629824 6080 38336 0 0 0 64 83582 2538927 5 95 0 0 0
> 596 0 0 2842624 6080 38336 0 0 0 0 6864 675841 6 94 0 0 0
> 590 0 0 2993472 6080 38336 0 0 0 0 9514 456085 6 94 0 0 0
> 503 0 0 3138560 6080 38336 0 0 0 0 8042 276024 4 96 0 0 0

> about 3G remain.
>
> <SLUB>
> procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
> r b swpd free buff cache si so bi bo in cs us sy id wa st
> 1066 0 0 323008 3584 18240 0 0 0 0 12037 47353 1 99 0 0 0
> 1101 0 0 324672 3584 18240 0 0 0 0 6029 25100 1 99 0 0 0
> 913 0 0 330240 3584 18240 0 0 0 0 9694 54951 2 98 0 0 0
>
> about 300M remain.
>
>
> So, about 2.5G - 3G difference in 8G mem.

Well not sure if that tells us much. Please show us the output of
/proc/meminfo after each run. The slab counters indicate how much memory is
used by the slabs.

It would also be interesting to see the output of the slabinfo command after
the slub run?



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