netdev - Re: KS8695: possible NAPI issue

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Date:	Tue, 02 Mar 2010 23:01:29 -0600
From:	Dick Hollenbeck <dick@...tplc.com>
To:	figo zhang <figo1802@...il.com>
CC:	Yegor Yefremov <yegorslists@...glemail.com>,
	netdev@...r.kernel.org, zealcook@...il.com
Subject: Re: KS8695: possible NAPI issue

figo zhang wrote:
> 2010/3/2 Dick Hollenbeck <dick@...tplc.com>:
>   
>> Yegor Yefremov wrote:
>>     
>>> I'm using 2.6.33 kernel and I noticed such a strange behavior:
>>>
>>> after system start I transfer one file via netcat from my development
>>> host, after this transfer the network is not functioning i.e. no pings
>>> possible etc.
>>>
>>> To narrow down the problem I checked out this commit
>>>
>>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=451f14439847db302e5104c44458b2dbb4b1829d.
>>> Till here the network driver is functioning as intended, but after
>>> NAPI introduction I have this issue. With latest git-pull of "Linus'
>>> kernel tree" I can't even ping right after the systems start.
>>>
>>> Any Ideas? What am I missing?
>>>
>>>       
>> No idea, although I am using the same ARM chip, my kernel is at 2.6.30.5,
>> and except for this occasional loss of connection I get, the ethernet driver
>> seems to work better than what you are reporting.
>>     
>
> from linux-2.6.32, this ethernet  driver have add NAPI support, would
> you like to
> try using this version?
>   

Seems like a lot of work for me, given that my 2.6.30.5 kernel is mostly 
working.   Yegor is having the problems on the newer kernels, newer than 
mine.  Sounds like a warning flag to me, not an incentive.

What is NAPI and why do I care?

Dick


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