Date: Tue, 21 Mar 2000 13:29:45 -0800 From: Mike Smith <msmith@freebsd.org> To: Brad Knowles <blk@skynet.be> Cc: "John W. DeBoskey" <jwd@unx.sas.com>, freebsd-current@FreeBSD.ORG, Brad Chisholm <sasblc@unx.sas.com> Subject: Re: AMI MegaRAID lockup? not accepting commands. Message-ID: <200003212129.NAA00839@mass.cdrom.com> In-Reply-To: Your message of "Tue, 21 Mar 2000 10:25:53 %2B0100." <v04220801b4fcf066fdde@[195.238.1.121]>
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> At 7:25 PM -0800 2000/3/20, Mike Smith wrote: > > > Not that I consider this particuarly optimal; busy-waiting for the > > controller is a terrible waste of the host CPU. A better solution would > > probably defer the command and try again a short time later, but let's > > see if this works first. > > Since this is a device driver, I guess you can't usleep() and > then check again? Is there anything else useful you could be doing > during that period of time -- other than busy waiting? Well, I call amr_done() to collect completed commands. There's not much other housekeeping that's possible at that point. -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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