Date: Mon, 22 Jan 2018 17:48:58 -0800 From: Adrian Chadd <adrian.chadd@gmail.com> To: Johannes Lundberg <johalun0@gmail.com> Cc: Hans Petter Selasky <hps@selasky.org>, Ian Lepore <ian@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: Periodical interrupt storm when playing game with USB keyboard Message-ID: <CAJ-VmoktYt4q4LsQ8x-n4xkmH=x6O=vWXUO-Zk4Gj74x8EGAFA@mail.gmail.com> In-Reply-To: <CAECmPwvr2on6_DDehnHd%2BRq1a1r2s-ib99MsabDSbxGo7Ykuhw@mail.gmail.com> References: <CAECmPwvDQBYw=mKJpZfUdKpXSC8GysZKSk0f9qaZEXCvy_QeMA@mail.gmail.com> <e2851846-0678-5cb9-0fce-e9cf49c41a2e@selasky.org> <CAECmPwvgMDBTUjhAERe4bKLgNYCim9bwdHw2JEL0RgTckMjSDw@mail.gmail.com> <CAECmPwtWr0t5_xLgg4NMxnjz317sqnfR9-ttH62szq4fwPdO=Q@mail.gmail.com> <64218617-98d2-0e6e-5872-e44106e61bf7@selasky.org> <1516569725.42536.99.camel@freebsd.org> <CAECmPws07U1=KkqgrjHotjnbPhX53n2L9Jj36guLruTJ-wc%2BCw@mail.gmail.com> <0aceb3ff-4938-1b29-d493-d83ce82cc853@selasky.org> <CAECmPwvr2on6_DDehnHd%2BRq1a1r2s-ib99MsabDSbxGo7Ykuhw@mail.gmail.com>
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Hi Yeah the timers eventually get coalesced unless someone's asking for a ridciulously accurate timer value. So is some driver asking for hyper-accurate callout timer that isn't being coalesced? hps, is there any useful debugging to try and find callouts that are requesting stupidly accurate timers? Maybe a dtrace probe on the callout schedule entry point? -adrian
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