Date: Thu, 17 Jul 2003 21:00:44 -0700 (PDT) From: Trent George <soundsampler@sbcglobal.net> To: sos@freebsd.org Cc: freebsd-performance@freebsd.org Subject: promise sx4000 card & tx4000 results over 170mb/s sustained read Message-ID: <20030718040044.96606.qmail@web80006.mail.yahoo.com>
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Hi Soren, I wanted to congratulate you on fantastic results in performance on a tx4000 card. I have a dual amd mb with 66mhz support slot. 4 western digital drives (180gb each) I have clocked sustained 176mb/s read from this raid0 array and 120+mb/s write writes seemed cpu bound ? (50% idle from second processor) reads 56% idle (first process close to maxed out) there were several tricks to getting this performance, custom kernel compile 1/ MAXPHYS=256k 2/ MAXBSIZE=256k 3/ atacontrol create RAID0 128 /dev/ad4 /dev/ad6 /dev/ad8 /dev/ad10 4/ newfs -U bs=262144 /dev/ar0 this allowed 64kb stripe size to use 4 drives on each "block" parallel reading i used iostat to monitor processor and transfer rate using following commands dd of=test.dat if=/dev/zero bs=64k count=20000 dd if=test.dat of=/dev/null bs=64k Question #2 I purchased a sx4000 card in the hope to increase speed :-) I noticed that PDC20621 is not in ata-chipset.c yet The card is not recognised on boot ether. Is there anything I can do or provide to help you add support for this card ? Question #3 Is there any plans to support intel SATA raid support on ICH5R (i865/i875) for boot up (sort of like promise and highpoint) I have been experimenting with gigabit ethernet and sustained 100mb/s samba read/write performance, and seem to be making good progress. also experimenting on huge writeback cache (400mb+) up from 1mb vfs.hirunningspace seems to help with impressive burst network transfer speed. Thanks Trent George PS I don't know if you remember but I sent an amd system to you a long time ago to help add support for highpoint chipsets, I appreciate all your great work.
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