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Re: netlink drops messages.

To: gleb@xxxxxxxxxxx (Gleb Natapov)
Subject: Re: netlink drops messages.
From: kuznet@xxxxxxxxxxxxx
Date: Tue, 16 Jan 2001 20:54:53 +0300 (MSK)
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20010116193553.B5122@xxxxxxxxxxx> from "Gleb Natapov" at Jan 16, 1 07:35:53 pm
Sender: owner-netdev@xxxxxxxxxxx
Hello!

>  Recently I noticed that when I simultaneously do 'up' to many network 
> interfaces
> (many is ~15) netlink drops part of the messages about interface state change 
> and thus 
> my userspace tools don't know that some interfaces are in up state now. The 
> error that 
> I get from netlink socket is "No buffer space available". 

Which means that applications must invalidate stored state
and to resynchronize doing dumps of all the necessary information.


> sk->receive_queue simultaneously is about 16 only!

16 or 116, this is not very essential.

Of course, page size is sort of overkill, but I do not want to estimate
required room forward. Application must be able to resync in any case.

Alexey

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