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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Date:   Mon, 4 Nov 2019 10:29:59 +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 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