netdev - Re: [PATCH] pktgen node allocation

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Date:	Fri, 19 Mar 2010 14:47:45 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	robert@...julf.net
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] pktgen node allocation

Le vendredi 19 mars 2010 à 14:35 +0100, robert@...julf.net a écrit :
> Eric Dumazet writes:
>  > Le vendredi 19 mars 2010 à 09:44 +0100, Robert Olsson a écrit :
>  > 
>  > I cannot understand how this can help.
>  > 
>  > __netdev_alloc_skb() is supposed to already take into account NUMA
>  > properties :
>  > 
>  > int node = dev->dev.parent ? dev_to_node(dev->dev.parent) : -1;
>  > 
>  > If this doesnt work, we should correct core stack, not only pktgen :)
>  > 
>  > Are you allocating memory in the node where pktgen CPU is running or the
>  > node close to the NIC ?
> 
>  I didn't say it should help the idea was to give some hooks to 
>  experiment and see effects with different node memory allocations.
>  There are many degrees of freedom wrt buses(device)/CPU/menory.
> 

Well, you said "Tested this with 10 Intel 82599 ports w. TYAN S7025
E5520 CPU's. Was able to TX/DMA ~80 Gbit/s to Ethernet wires."

I am interested to know what particular setup you did to maximize
throughput then, or are you saing you managed to reduce it ? :)


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