Re: slow sync of fat 32 hotplugged devices

[Bodo Eggert]

Patrick Fritzsch <fritzsch@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> It seems that the hal daemon mounts a usbstick in fat32 mode, where
> default the sync option ist on. Actually this is a nice behaviour,
> because a cp to the stick should last so long until the file was
> completly written.

[...]
> I guess that the kernel checks after every block of the file, which is
> written, if the stick has really written it, which leads to such a big
> slowdown. There are already lots of comments of this in the web, where
> the solution is always to disable the sync mode in the hal daemon device
> files.

The situation is worse: It will update the FAT each time a block is written.
Therefore the FAT area will wear out very quickly.

> Wouldnt it be a nice behaviour, if you could mount a file in a new sync
> mode, where it isnt synchronized during writing a file, only when a
> close ioctl command was executed on a filehandle?
> sync writing to hotplugged devices would be a lot faster then.

IMO it should sync on committed dentry updates, too.
-- 
Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
verbreiteten Lügen zu sabotieren.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/