Re: 2.6.24-rc3-mm1 (sync is slow ?)

[KAMEZAWA Hiroyuki]

Hi, Andrew

I got following result in 'sync' command.
It was too slow. (memory controller config is off ;)
I attaches my .config.
==
[2.6.24-rc3-mm1]
[kamezawa@dr-test2 ~]$ dd if=/dev/zero of=./tmpfile bs=4096 count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 1.46706 seconds, 279 MB/s
[kamezawa@dr-test2 ~]$ time sync

real    3m6.440s
user    0m0.000s
sys     0m0.133s


on, 2.6.23-rc2-mm1, 2.6.23-rc3 there was no problem.
==
[2.6.24-rc3]
[kamezawa@dr-test2 ~]$ dd if=/dev/zero of=tmpfile bs=4096 count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 2.07717 seconds, 197 MB/s
[kamezawa@dr-test2 ~]$ time sync

real    0m9.935s
user    0m0.001s
sys     0m0.113s

[2.6.24-rc3]
[kamezawa@dr-test2 ~]$ dd if=/dev/zero of=./tmpfile bs=4096 count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 1.37147 seconds, 299 MB/s
[kamezawa@dr-test2 ~]$ time sync[2.6.24-rc2-mm1]


real    0m11.718s
user    0m0.000s
sys     0m0.138s

==
-Kame

Attachment: myconfig
Description: Binary data