netdev - Re: [PATCH net-next v13 0/3] add hisilicon hip04 ethernet driver

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Date:	Thu, 15 Jan 2015 20:56:21 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Alexander Graf <agraf@...e.de>, Arnd Bergmann <arnd@...db.de>
CC:	<robh+dt@...nel.org>, <davem@...emloft.net>,
	<grant.likely@...aro.org>, <sergei.shtylyov@...entembedded.com>,
	<linux-arm-kernel@...ts.infradead.org>, <eric.dumazet@...il.com>,
	<xuwei5@...ilicon.com>, <zhangfei.gao@...aro.org>,
	<netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux@....linux.org.uk>
Subject: Re: [PATCH net-next v13 0/3] add hisilicon hip04 ethernet driver

On 2015/1/15 20:39, Alexander Graf wrote:
> 
> 
> On 15.01.15 10:42, Arnd Bergmann wrote:
>> On Thursday 15 January 2015 16:37:23 Ding Tianhong wrote:
>>> On 2015/1/14 18:19, Alexander Graf wrote:
>>>>
>>>> >From a 10000 feet perspective it looks like two problems to me
>>>>
>>>>   1) Allocation failure doesn't get handled properly somewhere
>>
>> This is the bug that Eric pointed out as well.
>>
>>>>   2) We fail to allocate with order=0 - I don't see why
>>
>> GFP_ATOMIC. When allocating from a the napi poll function in softirq
>> context, you have to use nonblocking allocations, which occasionally
>> fail. This should not cause any harm other than dropped packets.
>>
>>> is it easy to repetition this bug? how big is your memory on your board,
>>> is it happened in your previous hip04 driver?
>>
>> It should be independent of memory size, but may be more likely if you
>> don't have swap space configured.
> 
> With the previous driver I was unable to get this far - I ended up in
> random memory corruption and had a ~90% packet loss after about an hour
> of uptime.
> 
> I'm not sure whether it's easy to reproduce, I merely started up a few
> VMs, did some disk I/O and started to compile QEMU in the background ;).
> 
> I'll happily give your follow up patch that's going to fix the memory
> allocation problems a try though.
> 
Thanks for your work, I am sure we could make it much more better:)

Ding

> 
> Alex
> 
> .
> 


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