On Mon, 10 Apr 2006, Andrew Morton wrote:
Grzegorz Kulewski <[email protected]> wrote:
I am using big swap here (as a backing for potentially huge tmpfs). And I
wonder why swapon on such big (like 12GB) swap takes about 7 minutes
(continuous disk IO).
It's a bit quicker here:
vmm:/usr/src/25# mkswap /dev/hda6
Setting up swapspace version 1, size = 54031826 kB
vmm:/usr/src/25# time swapon /dev/hda6
swapon /dev/hda6 0.00s user 0.04s system 74% cpu 0.054 total
Is this expected?
Nope.
Why it is like that?
Are you using a swapfile or a swap partition?
Swap file.
If it's a swapfile then perhaps the filesystem is being inefficient in its
bmap() function. Which filesystem is it?
Ext3.
The kernel is 2.6.16-rc3-git2-ck1. There is -ck patch in it but I strongly
hope that swap prefetch is not *that* buggy to cause such things... I am
considering testing vanilla. Con CC'd.
The system is Athlon XP 2000MHz with 1GB of RAM and Samsung 80GB IDE hard
drive.
The second run of swapon is very fast (like 2 seconds). So it looks like
it has cached something in RAM?...
Thanks,
Grzegorz Kulewski
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