[OpenIndiana-discuss] USB 2 performance

[bentahyr at chez.com]

Hi Jean-Pierre,

I was using 2012.1.15AR.8 from SFE, with no specific option for mount command :
# ntfs-3g -o uid=101 /dev/dsk/c2t0d0p1 /mnt

Since then I switched to the last version available on your website (2015.3.14AR.1), and redid the test, still using the same mount command.
$ dd if=FreeDOS-1.1-memstick-2-2048M.img of=/mnt/FreeDOS-1.1-memstick-2-2048M.img
1412712+0 records in
1412712+0 records out
723308544 bytes (723 MB) copied, 2552.51 s, 283 kB/s
I stopped it as it wasn't necessary to wait 3h

$ dd if=FreeDOS-1.1-memstick-2-2048M.img of=/mnt/FreeDOS-1.1-memstick-2-2048M.img bs=4096
166643+0 records in
166643+0 records out
682569728 bytes (683 MB) copied, 2360.02 s, 289 kB/s
Stopped as well

Mount with big_writes option
# ntfs-3g -o big_writes,uid=101 /dev/dsk/c2t0d0p1 /mnt
$ dd if=FreeDOS-1.1-memstick-2-2048M.img of=/mnt/FreeDOS-1.1-memstick-2-2048M.img bs=4096
207578+0 records in
207578+0 records out
850239488 bytes (850 MB) copied, 3691.7 s, 230 kB/s
Stopped as well

Now I format the disk on Win7 to NTFS, 512b rather than defaulting to 4096b
$ dd if=FreeDOS-1.1-memstick-2-2048M.img of=/mnt/FreeDOS-1.1-memstick-2-2048M.img
172937+0 records in
172937+0 records out
708349952 bytes (708 MB) copied, 2367.44 s, 299 kB/s
Stopped as well

I don't really know what to blame, maybe the FUSE stage might the bottleneck here.
Maybe dd is not really the good command to test this as well.
I wanted to test exFAT as weel but I'm running out of time before going off until September.

Ben

----- Mail original -----
De: "Jean-Pierre André" <jean-pierre.andre at wanadoo.fr>
À: openindiana-discuss at openindiana.org
Envoyé: Mardi 28 Juillet 2015 20:16:25
Objet: Re: [OpenIndiana-discuss] USB 2 performance

Jean-Pierre André wrote:
> Aurélien Larcher wrote:
>> Hi,

[...]

>>>
>>> using NTFS-3g
>>> $ dd if=FreeDOS-1.1-memstick-2-2048M.img
>>> of=/mnt/FreeDOS-1.1-memstick-2-2048M.img
>>> 3948544+0 records in
>>> 3948544+0 records out
>>> 2021654528 bytes (2.0 GB) copied, 15867.8 s, 127 kB/s
>>>
>>> After reformating to UFS
>>> $ dd if=FreeDOS-1.1-memstick-2-2048M.img
>>> of=/mnt/ben/FreeDOS-1.1-memstick-2-2048M.img
>>> 3948544+0 records in
>>> 3948544+0 records out
>>> 2021654528 bytes (2.0 GB) copied, 110.893 s, 18.2 MB/s
>>>
>>>
>>> Yeah, really, something is wrong with the implementation of FAT/NTFS
>>> on OpenIndiana.
>>> Would a more recent NTFS-3G help ? Currently using 2012.1.15AR.8 from
>>> SFE.
>
> Which version of ntfs-3g were you using and what are
> your mount options ? What is the output of "ntfs-3g -help" ?
>

Oh, I forgot : retry dd with option "bs=4096", so that the
fuse kernel module need not concatenate write chunks (the
default block size is 512 for dd).

Jean-Pierre



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