Hi Deepak.
Thansk your reply,
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.
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)
Hung-Wei Chiu(邱宏瑋)
--
Computer Center, Department of Computer Science
National Chiao Tung University
Computer Center, Department of Computer Science
National Chiao Tung University
2017-03-24 14:31 GMT+08:00 Deepak Naidu <dnaidu@xxxxxxxxxx>:
>>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) <hwchiu@xxxxxxxxxxxxxx> 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 ?
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