Date: Thu, 2 Dec 1999 22:42:18 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Stephen McKay <syssgm@detir.qld.gov.au>, freebsd-scsi@FreeBSD.ORG Subject: Re: Tape driver problems Message-ID: <Pine.BSF.4.10.9912022241090.23244-100000@beppo.feral.com> In-Reply-To: <199912030632.WAA05573@mass.cdrom.com>
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> > > > See other mail. I still believe that the AHA driver should work better, > > but it's a low priority item now. > > This particular issue is a defect in the bounce-buffering code; the 1542 > is limited to 16 or maybe 17 s/g entries. (We allow 17, the Linux driver > stops at 16.) This isn't an issue for most things until you get up near > 64k, where fragmentation lets you run out of page-sized entries. I'm not > sure how best we could work around this without clustering pages in > bounce-buffer memory. If you've got any neat ideas I'll happily file > them for next time someone goes looking at that code. I've hacked on the AHA1542X substantially, but it's been years. It actually had a reasonable target mode. I just don't have time and if I solve the current problem a different way, we don't have to worry about it at the moment. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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