On Tue, Jan 07, 2014 at 01:58:32PM +0000, David Laight wrote: > The dmesg contains: > > [ 538.728064] EXT4-fs warning (device dm-0): ext4_end_bio:316: I/O error writing to inode 23330865 (offset 0 size 8388608 starting block 812628) > > An 8MB transfer will need at least 128 ring entries (TRB) even if the request > is a single contiguous memory block. > > Are you using the patch that increases the ring size from 64 to 256? It's likely that the block layer is breaking up the EXT4 write into several transfers, since usb-storage limits overall transfer size to 120 KB. In any case, I added more debugging in the last patch to print the number of TRBs necessary. That way we can verify the patch to limit the number of scatter-gather list entries is working. Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
