Albert Chin wrote:
I have an Intel S875PWP1 motherboard with a Pentium4 [EMAIL PROTECTED] PCI bus is 33Mhz, 32-bit. I recently purchased an LSI 320-2/128MB on eBay (though the card really looks like a PERC4/DS) and just ran some bonnie++ tests on a RAID 1 array between two U320 drives for the first channel and on a RAID 0 array between one U320 drive for the second channel. The 320-2 has the latest LSI firmware, 1L47.
[...]
I don't understand how #1 gives 16MB/s (RAID 1) while #3 gives only 17MB/s. I'd expect #3 to be about x2 the performance of #1.
The arrays are configured with "write-thru" write policy, "adaptive" read policy, and "cachedio" cache policy.
In LSI terms, "write-thru" means, "write cache is turned off". With that set, performance becomes very consistently describable as "poor", as your tests demonstrate. Linux can get around this a little bit in benchmarks by using larger I/O sizes than FreeBSD (FreeBSD is limited to 128K max, while Linux is not). These are very speedy cards once you put them into their intended configuration. With some decent SCSI disks and a PCI-X bus, it performs quite well. However, I'm actually kinda surprised that the card works at all in your 5V slot. Scott _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
