Comment 41 for bug 709245

Ah! /dev/urandom is the limiting factor ^^ USB HDD is also stuck at 1.9Mbps with the same test. Same test with of=/dev/null is only getting 2.0Mbps.

With the USB HDD and if=/dev/zero instead, and 10x count

root@linaro:~# dd if=/dev/zero of=/media/dump bs=40960 count=10000
10000+0 records in
10000+0 records out
409600000 bytes (410 MB) copied, 16.5168 s, 24.8 MB/s
root@linaro:~# dd if=/dev/zero of=/media/dump bs=40960 count=10000
10000+0 records in
10000+0 records out
409600000 bytes (410 MB) copied, 18.4294 s, 22.2 MB/s

With the patch out, this takes an insanely long time.

Against the USB stick, it rises to 7.1MBps with the patch in vs 3.5MBps with it out.

So nice job!