Date: Sat, 25 Oct 2003 22:28:18 +0200 (CEST) From: Soren Schmidt <sos@spider.deepcore.dk> To: Soren Schmidt <sos@spider.deepcore.dk> Cc: sos@FreeBSD.ORG Subject: Re: Possible mouse/ATA problems in -STABLE Message-ID: <200310252028.h9PKSIji037371@spider.deepcore.dk> In-Reply-To: <200310252018.h9PKIAvK037133@spider.deepcore.dk>
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It seems Soren Schmidt wrote: > > > ... > > > "This pushed the time spent between starting the ATA command and > > > starting the DMA engine over the hill for some controllers > > > (especially the Silicon Image DS3112a) and caused what looked > > > like lost interrupts." > > > > > > - so possibly we need another MFC... ? > > > > I think maybe we do. Unfortunately Soeren is not working on ATA in > > -stable. Is there anyone else (a committer?) who can verify that this > > analysis is correct? Can we circulate a patch? > > That change in -current doesn't not easily apply to -stable, and does > not change the amount of time spent in interrupt at all. The change > in current fixes total lockups of some controllers when the time > busdma use to setup the SG list is too long. Oh, maybe I should say that the ATA driver in -current is *very* different from the one in stable. This makes the idea of MFC's moot since very little code can be moved without a rewrite. This mandates significant testing etc since is will be like new virgin code. -Søren
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