XO-1.5 slow disk writes
Benjamin M. Schwartz
bmschwar at fas.harvard.edu
Tue Nov 17 13:03:29 EST 2009
Daniel Drake wrote:
> Today I tried to figure out why running "sync" often takes 5-10 seconds
> or longer. This slows down suspend, where all data is synced to disk.
On the XO-1, it was necessary to sync before suspend, because there was no
guarantee that a suspended laptop would reawaken any time soon. On 1.5
(and even on XO-1 with newer software) we should have fully working timed
wakeups. That means the kernel could set a policy of a "sync every 5
minutes", and wake up out of suspend in order to perform the sync. This
is, IMHO, actually better than a "sync on every suspend" policy, because
it enables things like write combining that improve performance and reduce
Of course, getting sync to be very fast would also be nice.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 198 bytes
Desc: OpenPGP digital signature
More information about the Devel