Hello, again. On 08/19/2010 11:17 AM, Tejun Heo wrote: > What was the configuration? If dm was involved, both md and dm can > only process single flush request at a time. Supporing multiple > flushes in flight wouldn't be too difficult. It's just the way things > are implemented with the previous barrier implementation. It can > definitely be improved. Oh, I just realized that the current bio-based dm implementation doesn't allow other bio's to be processed if a flush is in progress. So, it's not about not being able to handle multiple flushes. The queue just stalls while flush is in progress and because it also waits for flush completion by waiting for all commands in progress to finish. It basically ends up draining and stalling everything. Shouldn't be too hard to make it better. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
