hi, On Sa, 2013-03-09 at 12:03 +0000, David Pottage wrote: > Apparently the USB3 socket is not actually useful. anandtech.com > Benchmarked it when they reviewed the Chromebook, and only got > 12.7MB/s (while running ChromeOS), which is barely more than the > maximum speed for USB2. i know that method of measuring isnt very scientific but this is what i get on a userspace level (not turning off caches or using raw operations, but after all thats what you as user will see as well) ... i wonder if they tested the right port :) --- snip --- writing: ogra@chromebook:~$ sudo dd if=/dev/zero of=/mnt/foo.img bs=1M count=100 100+0 records in 100+0 records out 104857600 bytes (105 MB) copied, 1,03535 s, 101 MB/s reading ... ogra@chromebook:~$ sudo dd of=/dev/null if=/mnt/foo.img 204800+0 records in 204800+0 records out 104857600 bytes (105 MB) copied, 0,424303 s, 247 MB/s ogra@chromebook:~$ sudo dd of=/dev/null if=/mnt/foo.img 204800+0 records in 204800+0 records out 104857600 bytes (105 MB) copied, 0,425927 s, 246 MB/s and hdparm ... ogra@chromebook:~$ sudo hdparm -tT /dev/sda2 /dev/sda2: Timing cached reads: 2638 MB in 2.00 seconds = 1320.68 MB/sec Timing buffered disk reads: 118 MB in 3.03 seconds = 38.98 MB/sec ogra@chromebook:~$ sudo hdparm -tT /dev/sda2 /dev/sda2: Timing cached reads: 2338 MB in 2.00 seconds = 1170.17 MB/sec Timing buffered disk reads: 110 MB in 3.01 seconds = 36.58 MB/sec ogra@chromebook:~$ sudo hdparm -tT /dev/sda2 /dev/sda2: Timing cached reads: 2654 MB in 2.00 seconds = 1328.68 MB/sec Timing buffered disk reads: 122 MB in 3.01 seconds = 40.53 MB/se --- snap --- ciao oli
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