* Possible 32-bit PAE kernel I/O slow down with 3.3.X
@ 2012-04-26 3:22 Joe Ceklosky
0 siblings, 0 replies; 2+ messages in thread
From: Joe Ceklosky @ 2012-04-26 3:22 UTC (permalink / raw
To: linux-mm
I have notice significant slow downs with disk I/O on a 32-bit PAE 3.3.X
kernels.
The test machine has 16GB memory, Intel i5 CPU, Intel
motherboard, and an Intel 160GB SSD. I copied 536M from one partition
on an SSD to another.
Test 1:
kernel 3.3.2 32-bit PAE with kernel parm mem=3G
time cp -ra testdir/ /tmp
real 0m8.989s
user 0m0.094s
sys 0m1.080s
Test 2:
kernel 3.3.2 32-bit PAE
time cp -ra testdir/ /tmp
real 1m17.068s
user 0m0.173s
sys 0m2.149s
Also I tested kernel 3.2.16 32-bit PAE with no memory limits and it
was in line with test 1.
Am I doing something wrong or could something have been broken in PAE
with kernel 3.3.X?
Thanks,
Joe Ceklosky
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 2+ messages in thread
* Possible 32-bit PAE kernel I/O slow down with 3.3.X
@ 2012-04-27 1:53 Joe Ceklosky
0 siblings, 0 replies; 2+ messages in thread
From: Joe Ceklosky @ 2012-04-27 1:53 UTC (permalink / raw
To: linux-kernel
I have notice significant slow downs with disk I/O on a 32-bit PAE 3.3.X
kernels.
The test machine has 16GB memory, Intel i5 CPU, Intel
motherboard, and an Intel 160GB SSD. I copied 536M from one partition
on an SSD to another.
Yes, I should be using a 64bit kernel with 16GB!
Test 1:
kernel 3.3.2 32-bit PAE with kernel parm mem=3G
time cp -ra testdir/ /tmp
real 0m8.989s
user 0m0.094s
sys 0m1.080s
Test 2:
kernel 3.3.2 32-bit PAE
time cp -ra testdir/ /tmp
real 1m17.068s
user 0m0.173s
sys 0m2.149s
Also I tested kernel 3.2.16 32-bit PAE with no memory limits 16GB and it
was in line with test 1.
I can repeat and provide any debugging information if needed.
Thanks,
Joe Ceklosky
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-04-27 1:53 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-04-27 1:53 Possible 32-bit PAE kernel I/O slow down with 3.3.X Joe Ceklosky
-- strict thread matches above, loose matches on Subject: below --
2012-04-26 3:22 Joe Ceklosky
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.