Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds]
From: Eric Dumazet <hidden>
Date: 2014-02-08 14:30:09
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- 2014-02-08 · REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] · Thomas Glanzmann <hidden>
- 2014-02-08 · REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] · Thomas Glanzmann <hidden>
On Sat, 2014-02-08 at 15:19 +0100, Thomas Glanzmann wrote:
Hello Eric,
I get the idea. However I'm a little bit confused, when I do a 'git grep MSG_MORE' I don't see much references in the Linux kernel who use it at all. So do you have an example for me where this flags needs to be applied?
Idea would be to set this flag when calling sendmsg() of the 48 bytes of the header, and not set it on the sendmsg() of the 512 bytes of the payload. iscsi_sw_tcp_xmit_segment() already adds MSG_MORE, but it would be nice to add a new _initial_ flags parameter to iscsi_sw_tcp_xmit_segment()