Date: Wed, 11 Apr 2012 19:21:53 +0200 From: Gary Jennejohn <gljennjohn@googlemail.com> To: Jerry Toung <jrytoung@gmail.com> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: CAM disk I/O starvation Message-ID: <20120411192153.5672b62c@ernst.jennejohn.org> In-Reply-To: <CADC0LVm1HY2Dz%2BVk_GK35szRS6ySviLhMiL1TSRBOnPwQnBwRg@mail.gmail.com> References: <CADC0LV=-e%2B7PshRQdc69e2-Vktf6XFpVrqiMpx=QL4m_%2B9hSnw@mail.gmail.com> <20120403193124.46ad9de9@ernst.jennejohn.org> <CADC0LVm1HY2Dz%2BVk_GK35szRS6ySviLhMiL1TSRBOnPwQnBwRg@mail.gmail.com>
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On Tue, 3 Apr 2012 14:27:43 -0700 Jerry Toung <jrytoung@gmail.com> wrote: > On 4/3/12, Gary Jennejohn <gljennjohn@googlemail.com> wrote: > > > It would be interesting to see your patch. I always run HEAD but maybe > > I could use it as a base for my own mods/tests. > > > > Here is the patch > [patch removed] Just for the archive my bad disk performance seems to have been fixed in HEAD by svn commit r234074. Seems that all interrupts were being handled by a single CPU/core (I have 6), which resulted in abysmal interrupt handling when mutltiple disks were busy. Since this commit my disk preformance is back to normal and long lags are a thing of the past. -- Gary Jennejohn
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