Date: Tue, 21 Mar 2000 09:14:14 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Brad Knowles <blk@skynet.be> Cc: Mike Smith <msmith@FreeBSD.ORG>, "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: <200003211714.JAA81010@apollo.backplane.com> References: <200003210325.TAA70819@mass.cdrom.com> <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?
:
:--
: These are my opinions -- not to be taken as official Skynet policy
:======================================================================
:Brad Knowles, <blk@skynet.be> || Belgacom Skynet SA/NV
:Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124
For situations that aren't in the critical path and don't happen often,
it may be beneficial to do a voluntary context switch inside the loop.
-Matt
Matthew Dillon
<dillon@backplane.com>
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