In article <[email protected]>,
Xie, Bill <[email protected]> wrote:
>All,
>
>I am testing the multi-threaded IO performance on Opteron servers.
>
>I use dd as the test tools. The single dd can reach 60MBps for single disk.
>
>on 2.6.5 kernel, If dd numbers exceed the CPU numbers, vmstat bi reduced
>to 20MBps.
>
>on 2.4.21 kernel, multi-threaded IO performance works fine, even I run
>40 dd command at same time.
>
>Does anybody experienced similar issue also?
First, use a more recent kernel, 2.6.11.x or 2.6.12.x. Then try if
changing the I/O scheduler (/sys/block/sda/queue/scheduler) to
deadline or cfq makes a difference.
I'm using 2.6.11.x and the cfq scheduler on most servers right now.
Mike.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |