netdev - Re: [PATCH net-next] net/mlx4: use one page fragment per incoming frame

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Message-ID: <51ACDF70.4050301@hp.com>
Date:	Mon, 03 Jun 2013 11:24:48 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>
Subject: Re: [PATCH net-next] net/mlx4: use one page fragment per incoming
 frame

On 06/03/2013 11:12 AM, Eric Dumazet wrote:
> On Mon, 2013-06-03 at 11:05 -0700, Rick Jones wrote:
>
>> I take it this is a > 10 Gbit/s NIC?
>>
>
> Well, I guess so !
>
> Or something is really strange with this NIC !

Indeed.

>> What if any is the downside to an incoming stream of small packets?
>
> These kind of NIC are aimed for performance, I was told.
>
> 1) It would be strange to use them on memory constrained machines.
>
> 2) using 1536 bytes fragments is better than most other NIC drivers, as
> they usually use 2048 or 4096 bytes frags
>
> 3) Current memory allocations done in mlx4 uses order-2 pages, and
> nobody yet complained that these allocation might fail...

I was thinking more about getting up to a socket and finding 
insufficient overhead remaining to hold the packet.

rick

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