Feature #9345: look into using MSG_MORE and MSG_SENDPAGE_NOTLAST more - Linux kernel client - Ceph

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Feature #9345

closed

look into using MSG_MORE and MSG_SENDPAGE_NOTLAST more

Added by Ilya Dryomov over 9 years ago. Updated about 5 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Ilya Dryomov

Category:

libceph

Target version:

% Done:

Source:

other

Tags:

Backport:

Reviewed:

Affected Versions:

Description

Mike Christie pointed out the following:

In the current kernel we are doing tcp auto corking:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f54b311142a92ea2e42598e347b84e1655caf8e3

(here is more info on corking
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_MRG/2/html/Realtime_Reference_Guide/chap-Realtime_Reference_Guide-Sockets.html)

This can lead to similar perf issues if you are not using the MSG_MORE
and MSG_SENDPAGE_NOTLAST. I see the ceph kernel code is using the former
but not the latter.

Related issues 1 (0 open — 1 closed)