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>
index | next in thread | previous in thread | raw e-mail
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.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4316729A.9010702>