On 5/6/2010 1:22, Tejun Heo wrote:
Hello, Artem reported on bko#15918 that on his machine ahci probing takes too long (well, if you ask me, that's not too long but anyways). This is caused by CAP_SSS disabling parallel scan. The code was added by Arjan in commit 886ad09fc83342aa1c5a02a0b6d3298b78a8067f. There is a module parameter to skip this but I'm curious whether the change was based on an actual problem as on most PC hardware by the time ahci driver kick in, the BIOS has spun up everything already.
This was based on Jeff's review comments on an earlier patch that did not use SSS. The thing is, SSS means the system requests (well, demands) that we don't spin up the disks up in parallel.... which we really really ought to honor... Jeff had a very valid point. While today some bioses may spin everything up, that's not going to be the case going forward... the industry as a whole is moving away from that (slowly but steadily). -- 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
