Matthew Wilcox wrote: > Last December, I posted this: http://lwn.net/Articles/213635/ > > Here's an updated version. It shaves 5 seconds off boot time on my > configuration (qla2xxx, emulex, two ata_piix, dual fusion), but could > save more or less on other setups. > > I think I can remove the 'sync' argument and code from > ata_scsi_scan_host() now, but wanted to send out this update today. > > --- > > Some of the drivers (AHCI was mentioned to me as a culprit) take a long > time to discover all the devices attached to them. Even for ones which > are relatively quick, if you put a lot of them in a machine, it will > take a long time in aggregate. This can be fixed by adding support for > asynchronous scsi scans, which causes the time-consuming portions of > initialisation to take place in threads. > > Signed-off-by: Matthew Wilcox <matthew@xxxxxx> I think it's generally okay although it would need to spend quite some time in -mm and we'll need to exclude several drivers which require host-wide silence for mode programming (the current code is buggy but sequential probing hides it pretty well) till host-wide exclusion is implemented. Thanks. -- tejun - 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
