Date: Sun, 28 Sep 2008 16:59:53 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Danny Do <ai_quoc@hotmail.com> Cc: freebsd-questions@freebsd.org Subject: RE: Hard disk bottle neck. Message-ID: <20080928165534.X96877@wojtek.tensor.gdynia.pl> In-Reply-To: <BAY139-DAV95C49C49907D7EFE01A0190410@phx.gbl> References: <00d101c92154$691f53c0$3b5dfb40$@com> <48DF78C3.9080401@infracaninophile.co.uk> <BAY139-DAV95C49C49907D7EFE01A0190410@phx.gbl>
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> the following code: > > patch /usr/src/sys/sys/param.h > > #ifndef DFLTPHYS > #define DFLTPHYS (1024 * 1024) /* default max raw I/O transfer size > */ > #endif > #ifndef MAXPHYS > #define MAXPHYS (1024 * 1024) /* max raw I/O transfer size */ > #endif > #ifndef MAXDUMPPGS > > I'll update the result. I'll tell you how I go. Maybe sometimes in the next > fortnight. > > Thanks everyone, thanks Wojciech Puchar, after you recompile the kernel with that patch, check your disk performance in some directory consisting of many large files cd that_dir for x in *;do (cat $x >/dev/null &);done while running systat,:vmstat on another console i've just did this on one of my systems, with ONE 500GB SATA drive and with geli encryption. got 48MB/s and about 50% CPU load with core2 duo.
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