Comment 19 for bug 709245
Revision history for this message
| Ming Lei (tom-leiming) wrote Re: panda: USB disk IO slow | #19 |
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0e1f616
(Get the code!)
Another interesting thing, enabling usbmon will increase performance a lot.
root@tom-panda:~# dd if=/dev/sda iflag=direct of=/dev/null bs=128K count=32
32+0 records in
32+0 records out
4194304 bytes (4.2 MB) copied, 3.4598 s, 1.2 MB/s
root@tom-panda:~# cat /sys/kernel/
[1] 1485
root@tom-panda:~# dd if=/dev/sda iflag=direct of=/dev/null bs=128K count=32
32+0 records in
32+0 records out
4194304 bytes (4.2 MB) copied, 0.795455 s, 5.3 MB/s
root@tom-panda:~# dd if=/dev/sda iflag=direct of=/dev/null bs=128K count=32
32+0 records in
32+0 records out
4194304 bytes (4.2 MB) copied, 0.278628 s, 15.1 MB/s
root@tom-panda:~# killall -9 cat
[1]+ Killed cat /sys/kernel/
root@tom-panda:~# dd if=/dev/sda iflag=direct of=/dev/null bs=128K count=32
32+0 records in
32+0 records out
4194304 bytes (4.2 MB) copied, 5.0556 s, 830 kB/s
root@tom-panda:~# dd if=/dev/sda iflag=direct of=/dev/null bs=128K count=32
32+0 records in
32+0 records out
4194304 bytes (4.2 MB) copied, 3.2009 s, 1.3 MB/s