Date: Thu, 15 Feb 2007 11:55:03 -0800 From: "Kevin Oberman" <oberman@es.net> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-stable@freebsd.org Subject: Re: Very slow umass in 6.2-RC2 Message-ID: <20070215195503.18C3A45055@ptavv.es.net> In-Reply-To: Your message of "Thu, 15 Feb 2007 19:12:40 %2B0100." <er27qr$iq7$1@sea.gmane.org>
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> From: Ivan Voras <ivoras@fer.hr>
> Date: Thu, 15 Feb 2007 19:12:40 +0100
> Sender: owner-freebsd-stable@freebsd.org
>
> Alexander Shikoff wrote:
>
> > umass0: vendor 0x1005 USB FLASH DRIVE, rev 2.00/1.00, addr 2
> > da0 at umass-sim0 bus 0 target 0 lun 0
> > da0: < USB FLASH DRIVE 34CH> Removable Direct Access SCSI-0 device
> > da0: 40.000MB/s transfers
> > da0: 3936MB (8060928 512 byte sectors: 255H 63S/T 501C)
> >
> > Writing to this device is very slooooow.
> >
> > Time taken to copy file of 1,4G is near 30 min.
>
> 1400/1800=0.77... which looks suspiciously like the rate I get while
> copying over USB 1 port. What does "iostat 1" say while you're copying
> the file?
Looks a lot like a new 4GB drive I bought. It is painfully slow.
Here is the result of iostat:
tty ad0 da0 pass0 cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
0 77 16.00 1 0.02 4.00 48 0.19 0.00 0 0.00 0 0 1 0 99
0 231 0.00 0 0.00 4.00 48 0.19 0.00 0 0.00 3 0 1 2 94
0 649 0.00 0 0.00 4.00 36 0.14 0.00 0 0.00 3 0 2 2 94
0 77 9.00 2 0.02 4.00 1 0.00 0.00 0 0.00 2 0 1 1 97
0 77 9.00 2 0.02 0.00 0 0.00 0.00 0 0.00 4 0 1 0 95
This is (obviously) from the end of the transfer. Transfer rate varies
from .14 to .19 MB/s. While I have not one statistical analysis, it is
clear that the mode is .14 and I'd guess the median is around 16
KB/s. (I calculated it over 20 samples in the middle of the transfer.)
To say that this is dreadful is a major understatement, but I suspect it
is an issue with the drive. I will try it on Windows and see it it works
any better there. It might be crappy hardware. (At $30 for a 4GB drive,
it was certainly cheap.)
--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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