Date: Sat, 19 Nov 2005 13:38:25 +0100 From: =?ISO-8859-1?Q?Johan_Str=F6m?= <johan@stromnet.org> To: Pawel Jakub Dawidek <pjd@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: Page fault, GEOM problem?? Message-ID: <A94ACBF7-19F7-4A1C-9CEF-83B0DD0CF0AC@stromnet.org> In-Reply-To: <20051119013552.GC735@garage.freebsd.pl> References: <991F35AA-151B-4AEA-82BD-5F4AEDF28424@stromnet.org> <a78074950511180117r6d64db25o4ae37c0c5998e002@mail.gmail.com> <74994962-5050-47BD-897B-DE3880B9EBD5@stromnet.org> <a78074950511180943r57fd9d03r64efcc705001bc35@mail.gmail.com> <A6F22EE2-B1E6-44B5-B4C2-E77E1A24FEBB@stromnet.org> <1132353600.903.19.camel@genius1.i.cz> <BEE8C957-9DB5-4A08-AAAE-A1E524F4E092@stromnet.org> <20051119013552.GC735@garage.freebsd.pl>
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On 19 nov 2005, at 02.35, Pawel Jakub Dawidek wrote: > On Sat, Nov 19, 2005 at 01:55:57AM +0100, Johan Ström wrote: <snip> > +> I just noticed another thing... My disk performance... sucks! :P > +> > +> Some examples (from an otherwise unloaded system): > +> > +> root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero > bs=1024 count=1000000 > +> 1000000+0 records in > +> 1000000+0 records out > +> 1024000000 bytes transferred in 77.014797 secs (13296146 bytes/sec) > > You won't get more with such small block size. Try bs=128k. Hi Can't say that a bigger blocksize did much better.. root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero bs=128k count=10000 10000+0 records in 10000+0 records out 1310720000 bytes transferred in 98.519181 secs (13304211 bytes/sec) root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero bs=512k count=10000 ^C3587+0 records in 3587+0 records out 1880621056 bytes transferred in 145.049578 secs (12965367 bytes/sec) root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero bs=50k count=10000 10000+0 records in 10000+0 records out 512000000 bytes transferred in 38.536217 secs (13286203 bytes/sec) All this time, iostats MB/s column wouldnt go over 0.24MB/s... Back on GENERIC: root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero bs=128k count=10000 10000+0 records in 10000+0 records out 1310720000 bytes transferred in 99.497358 secs (13173415 bytes/sec) root@elfi:/home/johan$ time dd if=/dev/zero of=bigfile.zero bs=512k count=1000 1000+0 records in 1000+0 records out 524288000 bytes transferred in 39.019239 secs (13436654 bytes/sec) Still slow.. However, iostat goes up as high as 5.64MB/s on each disk in the mirror. > > -- > Pawel Jakub Dawidek http://www.wheel.pl > pjd@FreeBSD.org http://www.FreeBSD.org > FreeBSD committer Am I Evil? Yes, I Am!help
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