Date: Fri, 17 Apr 2009 08:24:31 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-current@freebsd.org Cc: Richard Todd <rmtodd@ichotolot.servalan.com>, Damian Gerow <dgerow@afflictions.org> Subject: Re: ZFS checksum errors on umass(4) insertion Message-ID: <200904170824.32184.hselasky@c2i.net> In-Reply-To: <49E7AC43.8050901@samsco.org> References: <49BD117B.2080706@163.com> <200904161804.42399.jhb@freebsd.org> <49E7AC43.8050901@samsco.org>
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On Friday 17 April 2009, Scott Long wrote: > > It could, and if that's happening, then some proactive measures should > be taken by the usb code to generate buffers that won't bounce. It > would suck to have to go through the bounce code for every single > keystroke or mouse movement. I haven't looked at the new usb code, > though, and I thought that the old code did a contigmalloc of some > sort to avoid this. USB uses an alignment of 1-byte for its data buffers. It should only bounce when the page the data buffer is residing on is above 4GB. --HPS
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