On Tue, Feb 22, 2005 at 04:50:00PM -0500, Tim Wesemann wrote: > I was apparently incorrectly basing it on the register's address space from > the lspci output. Can you perhaps help me tell a better way to tell if my > 2200S card is using "64-bit mode" (as in whatever the hell marketing people > mean by 64-bit).
I don't think your problem is "64 bit mode", whatever you mean by that. > My problem is in a nutshell -- performance. I can't get anything above > 40MB/s writes with this card with 5 15k-spin U320 disks in a raid5. I can > get better throughput with with a software raid5 running off of my on-board > AIC-7902 also running at 66MHz (but presumably in 64 bit mode), but I need > to use this card... That sounds like the bus is in single-ended mode (which is limited to 40MB/s) rather than LVD. Check cabling, terminators, etc. > Does this mean that PCI won't use "64-bit mode" (as in whatever the hell > marketing people mean by 64-bit) unless I have 4GB of system memory? There's 64-bit *transfers* and 64-bit *addressing* ... but let's not go into that; the problem isn't on the PCI bus, it's on the SCSI bus. Even 32-bit, 33MHz PCI is capable of at least 80MB/s. -- "Next the statesmen will invent cheap lies, putting the blame upon the nation that is attacked, and every man will be glad of those conscience-soothing falsities, and will diligently study them, and refuse to examine any refutations of them; and thus he will by and by convince himself that the war is just, and will thank God for the better sleep he enjoys after this process of grotesque self-deception." -- Mark Twain - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
