Date: Wed, 13 Feb 2002 17:15:11 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Michael Smith <msmith@freebsd.org> Cc: mike varga <mike.varga@cavium.com>, Steve Kargl <sgk@troutmask.apl.washington.edu>, freebsd-arch@freebsd.org Subject: Re: bus_dma_load_uio() function Message-ID: <3C6B0F9F.BC4C102E@mindspring.com> References: <200202131847.g1DIlwg01147@mass.dis.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Michael Smith wrote: > > It removes unnecessary > > copies. > > Typically, you let the kernel do this for you, via the physio interface. Mike's particular use would see any paging as a very big stall. Locking down mappings vs. wiring down pages pretty much wants the pages to be in the KVA space and mapped into the process, instead of vice-versa. His repsonse requirements are very similar to those of a video capture card. PS: Mike: make sure it generates interrupts; see Luigi Rizzo's current work with polling: even with polling, the trigger is an interrupt. ;^). -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3C6B0F9F.BC4C102E>