Very slow umass in 6.2-RC2

[Kevin Oberman]

> Date: Thu, 15 Feb 2007 11:55:03 -0800
> From: "Kevin Oberman" <oberman at es.net>
> Sender: owner-freebsd-stable at freebsd.org
> 
> --==_Exmh_1171569303_99072P
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> 
> > From: Ivan Voras <ivoras at fer.hr>
> > Date: Thu, 15 Feb 2007 19:12:40 +0100
> > Sender: owner-freebsd-stable at 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.)

To followup on my own message, Ivan is doing GREAT! 

FreeBSD 312 seconds
Windows 12 seconds
Wow! To say that these numbers do not make FreeBSD look good would be a
huge understatement.

Is Hans new umass available? If so, I might give it a try when I have a
chance.

Also, I just realized that I am on the wrong list as the system I'm
doing this on is running current, not stable.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4  EADA 927D EBB3 987B 3751
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