Messages in this thread | | | Date | Thu, 15 Dec 2005 19:28:09 +0100 | From | Patrick Fritzsch <> | Subject | slow sync of fat 32 hotplugged devices |
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Hallo, I checked out suse10 lately and discovered some annoying behaviour in hotplugging an USB Stick.
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.
Actually the performance is very bad. A 200 MB file needs around 10 Minutes in sync mode, while it needs around 1 Minute in not synchronous mode + executing a sync command later.
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.
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.
greetings, patrick - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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