Low perfomance when read from usb flash drive

[Artyom Mirgorodsky]

>Hi please explain what kind of test you have done. It's most likely not 
>related to USB, but rather the file system.
> Maybe you can run the following test on Windows and FreeBSD to compare:
> 
> dd if=/dev/da0 of=/dev/null bs=65536

I'm test on FreeBSD7-stable and FreeBSD-current and post results. Flash drive, FS, computer the same. Windows only for example.

PS
dd makes the same result - problem not in the file system
dd if=/dev/da0 of=/dev/null bs=65536
7281+0 records in
7281+0 records out
477167616 bytes transferred in 36.602952 secs (13036315 bytes/sec)

systat -vm

Disks   ad4   ad6   da0   cd0 pass0   sg0   sg1    151844 wire
KB/t  27.33  0.00 64.00  0.00  0.00  0.00  0.00    198628 act
tps       9     0   200     0     0     0     0    758680 inact
MB/s   0.25  0.00 12.50  0.00  0.00  0.00  0.00      1660 cache
%busy     0     0    99     0     0     0     0    288948 free


-- 
С уважением,
Артём Миргородский
tel: (056) 373 42 84
Jabber Id: artyom.mirgorodsky at gmail.com
mailto: man at alkar.net