IBM x335 onboard LSI 1020 (mpt) poor performance

[Moore, Eric Dean]

Would you be able to take a scsi bus trace to 
see what the negotiated speed over the bus?
Also would you able to see when the driver
loads if the PPR(Parallel Protocal Request) 
and WDTR(Wide data tranfer request) were issued
by the driver to both disk drives. If not, then
its possible your running at asyn narrow speeds
on one of the disk, which would be about 5-15 MB/sec.

Eric Moore
LSI Logic


On Thursday, April 15, 2004 1:51 PM, Kenneth Vestergaard Schmidt wrote:
> Hello.
> 
> We have a bunch of IBM x335's with an on-board LSI Logic 
> 1020, which I think
> is a single-channel version of the 1030.
> 
> The x335 has a hotswap SCSI backplane, with room for two 
> hotswap disks. If
> we use these independently, performance is fine.
> 
> However, as soon as we use the two disks in a RAID-1 
> configuration (made
> from the LSI BIOS), I/O-performance goes way down - writes 
> are averaging
> around 1.9-2.5 MB/sec, and reads are anywhere between 5-15 MB/sec.
> 
> My primitive test is dd'ing 100 MB data from /dev/zero to a 
> file, and that
> averages around 45 seconds. The same test performed on the 
> same server,
> using a stock RedHat Linux 8, averages around 2 seconds. I've 
> tested on
> 8 more-or-less identical x335's running FreeBSD 4.9 and once 
> with 5.2.1,
> and all give the same, poor performance.
> 
> Google only finds two things related to this - Matthew Jacob 
> mentioned he
> got limited read performance[1] but I'm not sure this is 
> related, and Eimar
> Koort seemed to experience[2] the same problems as us, but 
> got no answer.
> 
> dmesg details:
> 
> mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x2300-0x23ff mem 
> 0xfbfe0000-
>  0xfbfeffff,0xfbff0000-0xfbffffff irq 9 at device 1.0 on pci1
> pass1 at mpt0 bus 0 target 8 lun 0
> pass1: <IBM 25P3495a S320  1 1> Fixed Processor SCSI-2 device
> pass1: 3.300MB/s transfers
> da0 at mpt0 bus 0 target 0 lun 0
> da0: <LSILOGIC 1030 IM 1000> Fixed Direct Access SCSI-2 device
> da0: 160.000MB/s transfers (80.000MHz, offset 63, 16bit), 
> Tagged Queueing Enabled
> da0: 70001MB (143364061 512 byte sectors: 255H 63S/T 8924C)
> 
> The chip on the mainboard says "LSILogic 1020 B0". 
> Firmware/BIOS for both
> mainboard, drives and SCSI-controller are the newest 
> available on IBM's
> support-site, but as mentioned, RedHat performs fine and I'd 
> guess Windows
> would too, so it seems it's an issue related to FreeBSD only, 
> and then,
> only when using RAID.
> 
> I'll gladly test experimental stuff to find the cause of 
> this. We have a
> lot of these in production, but I can scrounge up 1-3 boxes 
> for testing
> different configurations/drivers/OS'es if anybody would like 
> to help us.
> Any help would be much appreciated.
> 
> -- 
> Best Regards
> Kenneth Schmidt
> 
> [1] 
> http://www.mail-archive.com/freebsd-hackers%40freebsd.org/msg3
6657.html
[2] http://news.gw.com/freebsd.scsi/3809
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