On Friday 29 July 2005 07:50, Andrew Morton wrote: > Andrey Borzenkov <[email protected]> wrote: > > Mandrake always mounted USB sticks with sync option; it was effectively > > noop except for a patch that implemented limited dsync semantic. > > > > Now, when full sync support for FATis in kernel, moutning with sync > > became real pain. Writing speed dropped from 3MB/s to 30KB/s in my case > > (and I am not alone). > > Unfortunately I think we're just going to have to live with that. It is > right that fatfs behaves as it does, and unfortunate that some distros will > operate slowly. > Well, I was not going to suggest killing sync support in FAT :) > For reference: how does mandrake implement this? Just in /etc/fstab? How > should we tell other people to fix this? > Yes, just fstab option. It has been "fixed" a couple of days ago by removing sync but I am going to test effect of dsync; it should behave more or less as before and provide at least some level of fs consistency. > > One idea how to improve situation - continue to mount with dsync (having > > basically old case) and do frequent sync of filesystem (this culd be > > started as HAL callout or whatever). Unfortunately, I could not find a > > way to request a sync (flush) of single mount point or block device. Have > > I missed something? > > It's trivial to do in-kernel but no, I'm afraid there isn't a userspace > interface for this. Oh well, let's do it in kernel to check if it is worth hassle. Thanks
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