netdev - [RFC] bnx2x: Insane RX rings

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Date:	Thu, 09 Sep 2010 22:45:05 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	netdev <netdev@...r.kernel.org>
Cc:	Eilon Greenstein <eilong@...adcom.com>
Subject: [RFC] bnx2x: Insane RX rings

So I have a small dev machine, 4GB of ram,
a dual E5540 cpu (quad core, 2 threads per core), 
so a total of 16 threads.

Two ethernet ports, eth0 and eth1, 

02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711E 10Gigabit PCIe
02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM57711E 10Gigabit PCIe

bnx2x 0000:02:00.0: eth0: using MSI-X  IRQs: sp 68  fp[0] 69 ... fp[15] 84
bnx2x 0000:02:00.1: eth1: using MSI-X  IRQs: sp 85  fp[0] 86 ... fp[15] 101


Default configuration :

ethtool -g eth0
Ring parameters for eth0:
Pre-set maximums:
RX:		4078
RX Mini:	0
RX Jumbo:	0
TX:		4078
Current hardware settings:
RX:		4078
RX Mini:	0
RX Jumbo:	0
TX:		4078

Problem is : With 16 RX queues per device , thats 4078*16*2Kbytes per
ethernet port.

Total : 

skbuff_head_cache 130747 131025    256   15    1 : tunables  120   60    8 : slabdata   8735   8735     40
size-2048         130866 130888   2048    2    1 : tunables   24   12    8 : slabdata  65444  65444     28

Thats about 300 Mbytes of memory, just in case some network trafic will occur.

Lets do something about that ?

Thanks


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