On 05/23/2013 02:10 PM, Hongyi Wang wrote: > I understand this is not a failure. But the problem is big IO which > causes "poll timeout" hugely degrades the performance. For my test, I > tried to write a 10GB file (bs=4m), which is expected to complete in 30m > even in 100M network bandwidth. But I cannot finish it in 2 hours > (actually I had to kill the task). That is a bit wield. Umm, your emailer disrupt the threading (it was in a new thread instead of the one it replied to), would be nice if you can fix this issue for a better mail threading review. how did you get 'expected to complete in 30m'? By the way bs=4m doesn't guarantee underlying iosched will always issue the requests with 4M requests to sheepdog, it is more of a hint. Do you use object cache? Looks to me you don't use object cache. Poll is means kernel is just waiting for the response without wasting any cycles. I am not sure why it takes longer than expected because it already take full speed of network, it means requests are sending in a full speed. |