Date: Tue, 18 May 1999 19:04:38 +0200 (CEST) From: Soren Schmidt <sos@freebsd.dk> To: mike@smith.net.au (Mike Smith) Cc: green@unixhelp.org, current@FreeBSD.ORG Subject: Re: ATA and afd (LS-120): got it WORKING! Message-ID: <199905181704.TAA28475@freebsd.dk> In-Reply-To: <199905181616.JAA03981@dingo.cdrom.com> from Mike Smith at "May 18, 1999 9:16:59 am"
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It seems Mike Smith wrote: > > > > No, it does not work at all with that maximum set. I'm using the disk to hold > > an FFS filesystem, and mounting it, BTW. See, in the old driver, it limited > > the transfer, but it ALSO queued the rest of the transfer. AFD doesn't, and > > I can tell this because I get random parts of kernel memory interspersed with > > my files (that's the corruption), so I know all of the buffer is not being > > filled. You need to queue the rest of the transfer too. > > I wrote the original code for this in wfd, and it requeues the transfer > for just this reason; the layer above doesn't retry the block operation > for the remaining residual. I'm not sure this is an error; it's too > long since I looked at the code, but I think there are some bad things > that can happen (or were suggested might happen) if you persist in > retrying the physical I/O. Well, the code uses d_maxio in many places, just not all regrettably :( That would be the way to solve this... -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the messagehelp
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