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To: "Eygene A. Ryabinkin" <freebsd@rea.mbslab.kiae.ru>
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Cc: hackers@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: Low umass performance with USB 2.0 ports
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Eygene A. Ryabinkin wrote:
>>    I had exactly this problem with Kingston Data Traveler II+, and 
>>apparently completely solved it by adding a kludge to disallow Cache 
>>Syncronization.  Try it yourself.
> 
>  And the kludge is?

It's on my home machine, and I'm travelling now.  But it's easy.  Look 
at /sys/cam/scsi/scsi_da.c, look for the da_quirk_table array, and add 
the flag DA_Q_NO_SYNC_CACHE to your pen drive specs.

There are lots of quirks for pen drives there, just copy one of then and 
edit the string identifiers.