Date: Tue, 08 Jun 1999 00:34:01 -0600 From: Warner Losh <imp@harmony.village.org> To: Zhihui Zhang <zzhang@cs.binghamton.edu> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: The choice of MAXPHYS Message-ID: <199906080634.AAA03429@harmony.village.org> In-Reply-To: Your message of "Thu, 03 Jun 1999 10:40:10 EDT." <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu> References: <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu>
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In message <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu> Zhihui Zhang writes: : The value of MAXPHYS is chosen to be 64K for the maximum raw I/O transfer : size. I am wondering why it is not set larger. I don't think that it is possible to guarantee that you can do a larger write than 64k on a aha-1542 card given the worst case scatter gather list you can have in FreeBSD. I think that this used to be a common limit. I thought CAM raised the limit somewhat on cards that could support it. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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