Date: Tue, 30 Aug 2005 16:50:31 +0400 From: "Eygene A. Ryabinkin" <freebsd@rea.mbslab.kiae.ru> To: Eugene Grosbein <eugen@kuzbass.ru> Cc: hackers@freebsd.org, freebsd-usb@freebsd.org Subject: Re: Low umass performance with USB 2.0 ports Message-ID: <20050830125031.GA775@rea.mbslab.kiae.ru> In-Reply-To: <4314523D.79926C81@kuzbass.ru> References: <20050830092818.GD881@rea.mbslab.kiae.ru> <4314523D.79926C81@kuzbass.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
> > What is filesystem has your USB drive? The one I was extensively testing has FAT, but I've checked the UFS2 -- just a bit better -- 1.8 Mb/second. But you're right -- no wdrains at all. > FreeBSD 4.x had very low performance with FAT filesystem, > writing process spent lots of time in the wdrain state too. Yes, it has. But here the same flash drive gives different results for ehci and uhci devices, and the total speed of echi is lower due to wdrains: 300 Kb/sec versus 500 Kb/sec. And I sometimes write my data to the Windows partition with FAT to my home HDD -- it has no wdrains. At least, I've not noticed them. For flash I can. -- rea
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050830125031.GA775>