[gpfsug-discuss] TCP_QUICKACK

[IBM Spectrum Scale]

Hi Aaron,

I just searched the core GPFS source code.  I didn't find TCP_QUICKACK
being used explicitly.

Regards, The Spectrum Scale (GPFS) team

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From:	"Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]"
            <aaron.s.knister at nasa.gov>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	08/13/2018 02:48 PM
Subject:	[gpfsug-discuss] TCP_QUICKACK
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



This is a question mostly for the devs. but really for anyone who can
answer.

Does GPFS use the TCP_QUICKACK socket flag on Linux?

I’m debugging an IPoIB problem exacerbated by GPFS and based on the packet
captures it seems as though the answer might be yes, but I’m curious if
GPFS is explicitly doing this or if there’s just a timing window in the RPC
behavior that just makes it look that way.

-Aaron


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