Hi Deepak. Thansk your reply,
I try to use gperf to profile the ceph-osd with basic mode (without RDMA) and you can see the result in the following link. http://imgur.com/a/SJgEL In the gperf result, we can see the whole CPU usage can divided into three significant part, (Network: 36%, FileStore: 17% PG related:29%). Do you have any idea about this? Thanks. Best Regards, Hung-Wei Chiu(邱宏瑋) -- Computer Center, Department of Computer Science National Chiao Tung University 2017-03-24 14:31 GMT+08:00 Deepak Naidu <dna...@nvidia.com>: > >>Now, the kernel can decrease the CPU cycle usages for network I/O > processing because of RDMA enabled (right?). > > Yes, kernel should have comparatively free cycles when using RDMA over TCP > > >>does it means host can provide more CPU for other processing, such as > Disk I/O ? > > This can be subjective, bcos let's say u have an IO process which takes 10 > mins over TCP then when using RDMA it might be 3 mins as your CPU cycles > are less used by RDMA but if ur application process which provides the RDMA > functionality might have processing cycles as well, which might use CPU > cycles as well, example client or fuse plugins on the host getting it ? > > > -- > Deepak > > > On Mar 23, 2017, at 11:10 PM, Hung-Wei Chiu (邱宏瑋) <hwc...@cs.nctu.edu.tw> > wrote: > > > > Now, the kernel can decrease the CPU cycle usages for network I/O > processing because of RDMA enabled (right?). > > does it means host can provide more CPU for other processing, such as > Disk I/O ? > > ------------------------------------------------------------ > ----------------------- > This email message is for the sole use of the intended recipient(s) and > may contain > confidential information. Any unauthorized review, use, disclosure or > distribution > is prohibited. If you are not the intended recipient, please contact the > sender by > reply email and destroy all copies of the original message. > ------------------------------------------------------------ > ----------------------- >
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