* Alan Stern schrieb am 28.09.05 um 18:58 Uhr: > On Wed, 28 Sep 2005, Marc Schiffbauer wrote: > > > Hi all, > > > > I have an usb-storage device in my Computer hat can handle several > > memory-cards like CF, SD, MMC, MS and SM Cards. > > > > I often read/write to my 1 gig SD card (USB 2.0). Reading is always > > fast (~ 5MB/s) using Kernel 2.6.12 or 2.6.13. > > > > But: Writing to the card is very very slow: < 40 kb/s. > > > > My kubuntu system mounts that kind of devices like that: > > /dev/sda1 on /media/sda1 type vfat > > > > (rw,noexec,nosuid,nodev,sync,quiet,uid=1000,gid=1000,umask=077,iocharset=utf8) > > > > Now I discovered that if I do a "mount -o remount,async /meda/sda1", > > the writing speed increases to a normal value of about 5 megs/s. > > > > I remember, that the problem did not exist with earlier kernels > > (and this version of kubuntu) > > > > I think this might be a kernel bug introduced by some patch applied before > > 2.6.12. > > It's not a bug; it's deliberate. :-) > > See this bug report: > > http://bugzilla.kernel.org/show_bug.cgi?id=4882 >
Thanks Alan for pointing to it. Seems like using sync on FAT devices is a very bad idea... now the question is how to I make hald - or whatever mounts the drive in the end - not to use the sync option... but that is Offtopic I guess. Thanks again! Cheers -Marc -- +-O . . . o . . . O . . . o . . . O . . . ___ . . . O . . . o .-+ | Ein Service von Links2Linux.de: / o\ RPMs for SuSE | | --> PackMan! <-- naeheres unter | __| and others | | http://packman.links2linux.de/ . . . O \__\ . . . O . . . O . | ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
