Date: Mon, 25 Mar 2013 02:38:25 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: Eric van Gyzen <eric@vangyzen.net> Cc: stable@FreeBSD.org Subject: Re: [patch] IPMI KCS can drop the lock while servicing a request Message-ID: <514F8061.7070206@FreeBSD.org> In-Reply-To: <514E6ED8.9040305@vangyzen.net> References: <514E6ED8.9040305@vangyzen.net>
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On 24.03.2013 07:11, Eric van Gyzen wrote: > At work, we discovered that our application's IPMI thread would often > use a lot of CPU time. The KCS thread uses DELAY to wait for the BMC, so > it can run without sleeping for a "long" time with a slow BMC. It also > holds the ipmi_softc.ipmi_lock during this time. When using adaptive > mutexes, an application thread that wants to operate on the > ipmi_pending_requests list will also spin during this same time. We suffer from the same problem, too. > > We see no reason that the KCS thread needs to hold the lock while > servicing a request. We've been running with the attached patch for a Well, this seems to be true. I'll try to commit something like this patch in several days. > few months, with no ill effects. > > Eric > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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