Date: Wed, 24 Aug 2005 13:27:56 +0400 From: "Vasim Valejev" <vasim@human-capital.ru> To: <freebsd-amd64@freebsd.org> Subject: Slow PCI-X controller perfomance (adaptec 2130SLP) Message-ID: <00d601c5a88e$1cb8c260$2107a8c0@vasimwork>
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Hi ! I've tried to set up FreeBSD-current on Dual opteron box with Adaptec 2130SLP PCI-X RAID controller (256MB memory). My tests did show that maximum transfer rate from controller to OS was about 132MB/s. That is very strange since PCI-X maximum speed should be about 1GB/s. Why the controller was so slow? Because poor driver or my method of the test? To test transfer rate, i just did run command "dd if=/dev/aacd1 of=/dev/null bs=8k count=4k" many times (may be i'm wrong but the controller shall cache this request in its memory). Change of hw.aac.iosize_max to 98k did a very little effect. My system config: Tyan K8SD Pro (S2882-D) motherboard (onboard SATA controller was turned off) 2xOpteron 244 2GB memory (2x512MB RAM stick for each CPU) Adaptec 2130SLP RAID controller with 256MB memory and backup battery (tried every PCI-X slot on the MB with same results) Six Maxtor Atlas 15K2 36GB drives (8E036J0) on the SCSI channel (but only four was used for /dev/aacd1, RAID5 with 64K stripe) FreeBSD7.0-CURRENT/amd64 (Tested with 5.4-RELEASE/amd64 and 6.0-BETA2/386 but no difference). Vasim V.
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