netdev - Re: KS8695: possible NAPI issue

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Date:	Fri, 5 Mar 2010 14:54:44 +0800
From:	figo zhang <figo1802@...il.com>
To:	Yegor Yefremov <yegorslists@...glemail.com>
Cc:	Dick Hollenbeck <dick@...tplc.com>, netdev@...r.kernel.org,
	zealcook@...il.com
Subject: Re: KS8695: possible NAPI issue

2010/3/4 Yegor Yefremov <yegorslists@...glemail.com>:
>>>> 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?
>
> Figo, I just looked at the 2.6.32 kernel and found out that it
> doesn't' contain NAPI support (see the history
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.32.y.git;a=history;f=drivers/net/arm/ks8695net.c;h=2a7b7745cc55b54cefada690b0ea47865b54b6b9;hb=HEAD).
> So 2.6.33 is the first stable kernel to support NAPI.
>
> I made some further tests but I can't find the reason for network
> failures: the interrupts are coming and the packets will be received
> and sent so that rx/tx counters would be increased, but none of them
> seem to reach the IP stack. I don't know where and why the things get
> desynchronized.
>
> Could you try the 2.6.33 or Linus tree? Thank you in advance.

yes, i have test it on linux-2.6.33, it is work well.
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