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>
Did you look at SATA alone?
Since SATA does its own scan asynchronously from SCSI itself, doing this
seems of little value. This patch doesn't change AHCI scanning at all,
for example.
Quite willing to be convinced otherwise, though...
Jeff
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