Date: Thu, 13 Dec 2001 20:00:36 -0800 From: Mike Smith <msmith@freebsd.org> To: "Mark Brown" <simm_s_list@hotmail.com> Cc: hackers@freebsd.org Subject: Re: uiomove (CPU) performance? Message-ID: <200112140400.fBE40al06791@mass.dis.org> In-Reply-To: Message from "Mark Brown" <simm_s_list@hotmail.com> of "Thu, 13 Dec 2001 22:06:42 EST." <OE435dRuYnZlmDVRXGs00001ade@hotmail.com>
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> The code is kernel mode so I do not think the memcopy routine uses uiomove > in this case(I could be wrong). Also this code is multiplatform so > that the general code uses memcopy and developers optimize the code to work > on the different platforms they are in. Speed is not my > concern right now because we can max out the speed of the device we are > copying from. Our problem lies in the CPU utilization. Will > uiomove be better than memcopy in that respect or the same? Since the restriction is memory bandwidth for the copy, performance is unlikely to be much different. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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