netdev - Re: ping6 packets high probability loss occurs by the default firewalld rule(rpfilter invert) with low traffic generated by iperf

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Message-ID: <6b6361fd-9ea1-93be-a60b-ac051bda4c10@huawei.com>
Date:   Tue, 12 Nov 2019 09:26:08 +0800
From:   hujunwei <hujunwei4@...wei.com>
To:     Eric Dumazet <eric.dumazet@...il.com>, <dsahern@...il.com>,
        <davem@...emloft.net>, <kafai@...com>, <weiwan@...gle.com>
CC:     <netdev@...r.kernel.org>, <wangxiaogang3@...wei.com>,
        <xuhanbing@...wei.com>
Subject: Re: ping6 packets high probability loss occurs by the default
 firewalld rule(rpfilter invert) with low traffic generated by iperf


On 2019/11/4 10:29, hujunwei wrote:
> 
> 
> On 2019/11/4 2:53, Eric Dumazet wrote:
>>
>> By how much have you increased gc_thresh ?
>>
>> I wonder if you are not hit by RCU being unable to drain its queue fast enough.
>>
>> Could you try backporting :
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cfcdef5e30469f3f2d6786ad35fc3fdef2a3833f
>>
>> But the default gc_thresh of 1024 might be too small for this patch
>> to make any difference, since (1024 >> 7) is 8 
>>
>>
> 
> Hi Eric,
> Thanks for your reply, I set gc_thresh to 10240 last time. I will backport and test the patch later.
> 
> Regards Junwei
> 

Hi Eric,
I applied the patch and find packetes still drop with default value of gc_thresh.
I will submit a patch later.

Regards Junwei