Slow PCI-X controller perfomance (adaptec 2130SLP)

Steven Hartland killing at
Fri Aug 19 11:02:25 GMT 2005

Sounds harsh but its Adaptec I wouldn't expect good performance
they have gone way down in my estimates recently with bad support
bad drivers, in general poor products.

There was a thread about SATA Highpoint RAID 5 controllers a few
months back however which may well have some useful things in
you may want to try to increase performance.

>From memory key things where:
* vfs.read_max
* RAID strip size
* kernel variable tweak ( cant remember the exact details )

    Steve / K
----- Original Message ----- 
From: "Vasim Valejev" <vasim at>
To: <freebsd-amd64 at>
Sent: 24 August 2005 10:27
Subject: Slow PCI-X controller perfomance (adaptec 2130SLP)

> 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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