That thread is pretty old and I couldn't really find many references (on google) about it. Perhaps its been fixed in later revisions of the AMD-768? -- ---------- Original Message ----------- From: Richard Scobie <richard@xxxxxxxxxxx> To: linux-raid@xxxxxxxxxxxxxxx Sent: Mon, 18 Oct 2004 16:44:20 +1300 Subject: Re: Poor RAID5 performance on new SMP system > Marc wrote: > > Hi, > > I recently upgraded my file server to a dual AMD 2800+ on a Tyan Tiger MPX > > motherboard. The previous server was using a PIII 700 on an Intel 440BX > > motherboard. I basically just took the IDE drives and their controllers > > across to the new machine. The strange thing is that the RAID-5 performance > > is worse than before! Have a look at the stats below: > > Hi Marc, > > Unfortunately you have a lemon :( > > I spent some time trying to get acceptable performance out of an > Adaptec SCSI RAID 0 on the 32 bit, 33MHz bus of one of these boards > and eventually found this: > > http://forums.2cpu.com/showthread.php? s=c8040a4e9c9b6390dd389f1b3cca32de&threadid=31211&perpage=15 > > The executive summary is > > "After testing AMD determined that the problem was identified as a > bandwidth issue(this was startling information). It appears that the > motherboard has a bandwidth limitation of 25MB/s on PCI devices that > are connected through the AMD 768 Southbridge." > > This was in line with my findings. > > I have not tried, but it is possible that a 64 bit 66MHz IDE card > will be OK. > > Regards, > > Richard > - > To unsubscribe from this list: send the line "unsubscribe linux- > raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More > majordomo info at http://vger.kernel.org/majordomo-info.html ------- End of Original Message ------- - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
