Thank you for the input. The reason why I'm using the old drivers/ide is because I'm using a TI Davinci ARM processor in an embedded system. They wrote a PalmChip driver for the older IDE interface and I don't think they have anything yet for the drivers/ata (out of curiousity is the newer drivers/ata the reason why PATA devices show up as /dev/sda in newer kernels?) After spending most of the day today adding printks and learning about the old ide driver I'm pretty much convinced that the IDE driver is working fine. The long delays are actually between block driver request queues. In the 2.6.10 kernel the time between block writes is less than 1 ms, where as the 2.6.32 that TI has blessed takes 8+ ms between blocks that are pushed to the IDE interface. Like I mentioned earlier I tried changing the I/O scheduler to Noop and as for the elevator. Anything else I should look to so I get blocks sent out faster? Thanks -----Original Message----- From: linux-ide-owner@xxxxxxxxxxxxxxx [mailto:linux-ide-owner@xxxxxxxxxxxxxxx] On Behalf Of Alan Cox Sent: Saturday, September 18, 2010 6:59 PM To: Joshua Hintze Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-ide@xxxxxxxxxxxxxxx Subject: Re: PATA IDE is slower in newer versions of kernel > I'm dedicated to continue working on the problem, I just need to advice from the linux community. I've tried different I/O schedulers such as noop and anticipatory and I'm studying the ide-dma code but still lost to where this is happening. drivers/ide is pretty much obsolete - so what you are seeing is doubly odd. Most stuff now is using the newer drivers/ata code which can support SATA, NCQ etc unlike the old codebase. One thing to check would be whether using the drivers/ata code shows the same problem. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3143 - Release Date: 09/18/10 00:34:00 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
