Sorry, loks like list mailer doesn't like SMIME messages. On Thursday 19 of May 2011 21:04:54 Hubert Kario wrote: > On Wednesday 18 of May 2011 00:02:52 Stephane Chazelas wrote: > > Hiya, > > > > I've not found much detail on what the "ssd" btrfs mount option > > did. Would it make sense to enable it to a fs on a USB flash > > drive? > > yes, enabling discard is pointless though (no USB storage supports it > AFAIK). > > > I'm using btrfs (over LVM) on a Live Linux USB stick to benefit > > from btrfs's compression and am trying to improve the > > performance. > > ssd mode won't improve performance by much (if any). > > You need to remember that USB2.0 is limited to about 20-30MiB/s (depending > on CPU) so it will be slow no matter what you do > > > Would anybody have any recommendation on how to improve > > performance there? Like what would be the best way to > > enable/increase writeback buffer or any way to make sure writes > > are delayed and asynchronous? Would disabling read-ahead help? > > (at which level would it be done?). Any other tip (like > > disabling atime, aligning blocks/extents, figure out erase block > > sizes if relevant...)? > > aligning logical blocks to erase blocks can give some performance but the > only way to make it really fast is not to use USB > > > Many thanks in advance, > > Stephane -- Hubert Kario QBS - Quality Business Software 02-656 Warszawa, ul. Ksawerów 30/85 tel. +48 (22) 646-61-51, 646-74-24 www.qbs.com.pl -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
