Date: Thu, 01 Sep 2005 00:16:42 -0300 From: =?UTF-8?B?Sm/Do28gQ2FybG9zIE1lbmRlcyBMdcOtcw==?= <jonny@jonny.eng.br> To: "Eygene A. Ryabinkin" <freebsd@rea.mbslab.kiae.ru> Cc: hackers@freebsd.org, freebsd-usb@freebsd.org Subject: Re: Low umass performance with USB 2.0 ports Message-ID: <4316729A.9010702@jonny.eng.br> In-Reply-To: <20050831055026.GE1645@rea.mbslab.kiae.ru> References: <20050830092818.GD881@rea.mbslab.kiae.ru> <4314CBCE.7010405@jonny.eng.br> <20050831055026.GE1645@rea.mbslab.kiae.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
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.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4316729A.9010702>