[gpfsug-discuss] TCP_QUICKACK

[Aaron Knister]

Thanks! Appreciate the quick answer.

On 8/13/18 3:25 PM, IBM Spectrum Scale wrote:
> Hi Aaron,
> 
> I just searched the core GPFS source code. I didn't find TCP_QUICKACKbeing used explicitly.
> 
> Regards, The Spectrum Scale (GPFS) team
> 
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> Inactive hide details for "Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]" ---08/13/2018 02:48:53 PM---This is a question mostly f"Knister, Aaron S. (GSFC-606.2)[InuTeq, LLC]" ---08/13/2018 02:48:53 PM---This is a question mostly for the devs. but really for anyone who can answer. Does GPFS use the TCP_
> 
> 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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-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776