netdev - RE: [PATCH net 4/5] be2net: wait longer to reap TX compls in be

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Date:	Mon, 24 Feb 2014 10:58:25 +0000
From:	Sathya Perla <Sathya.Perla@...lex.Com>
To:	David Laight <David.Laight@...LAB.COM>,
	Somnath Kotur <Somnath.Kotur@...lex.Com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	Vasundhara Volam <Vasundhara.Volam@...lex.Com>
Subject: RE: [PATCH net 4/5] be2net: wait longer to reap TX compls in
 be_close()

> -----Original Message-----
> From: David Laight [mailto:David.Laight@...LAB.COM]
> 
> From: Of Somnath Kotur
> > be_close() currently waits for a max of 200ms to receive all pending
> > TX compls. This timeout value was roughly calcuated based on 10G
> > transmission speeds and the TX queue depth. This timeout may not be
> > enough when the link is operating at lower speeds or in
> > multi-channel/SR-IOV configs with TX-rate limiting setting.
> > Increase the timeout to 2000ms and also bail-out if there is
> > a HW-error.
> 
> What about monitoring whether transmits are actually completing,
> and giving up if none are completed within a suitable time period?
> 

David, the code already does that. All the queues are checked for
any new TX compls each 1ms in the be_close()->be_tx_compl_clean()
path. This patch is not changing that logic.

thanks,
-Sathya
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