netdev - Re: [PATCH net-next 2/2] net: doc: add default value for neighbour parameters

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Date:	Thu, 06 Dec 2012 10:58:49 +0800
From:	Shan Wei <shanwei88@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	David Miller <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] net: doc: add default value for neighbour
 parameters

Ben Hutchings said, at 2012/12/6 9:43:
>>  neigh/default/unres_qlen - INTEGER
>>  	The maximum number of packets which may be queued for each
>>  	unresolved address by other network layers.
>>  	(deprecated in linux 3.3) : use unres_qlen_bytes instead.
>> +	Prior to linux 3.3, the default value is 3 which may cause
>> +	secluded packet loss. The current default value is calculated
>           ^^^^^^^^
> I think the proper word here is 'silent'?

The number of lost packets is recorded in unresolved_discards
of /proc/net/stat/arp_cache. Although, arp_cache is not easy
to understand(I still don't know why we need so many rows),
We can confirm dropping event from unresolved_discards in last column.
The dropping event is not marked by absence of sound.

But for general user who using TCP/UDP or ping to sending packets
out, can't simply find the dropping reason that destination ip is unresolved.
They just doubt about the TCP/UDP or ping. So I use 'secluded' which is hidden
from general view.

My English is not good enough, if missing something, please point to me.
Thanks.

Best Regards
Shan Wei

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