Messages in this thread | | | Date | Mon, 11 Oct 2004 13:05:09 +0200 | From | Pierre Ossman <> | Subject | MMC performance |
| |
I've added SGIO support to my driver now hoping that it would resolve the piss-poor performance I've been getting. Didn't do much difference though.
Read operations are fairly fast. It queues 8kB at a time. A bit small perhaps, but still decent.
Writing, however, only sends a single sector at a time. The queue process eats up half of the CPU time on my machine during a write. And since MMC cards have to clear a whole bunch of sectors before a write shouldn't you send as many sectors as possible to them?
Since I don't have another controller to compare with I don't really know if the problem is in my code, the MMC layer, the block layer or the filesystem.
I'm going to dig around a bit more but some pointers are welcome. At least which layer I should be looking at.
Rgds Pierre - 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/
| |