netdev - Re: [PATCH net-next 0/3] bnx2x: minimize RAM usage in kdump

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Date:	Wed, 26 Feb 2014 15:28:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ariele@...adcom.com
Cc:	mschmidt@...hat.com, netdev@...r.kernel.org, dmitry@...adcom.com,
	yuvalmin@...adcom.com
Subject: Re: [PATCH net-next 0/3] bnx2x: minimize RAM usage in kdump

From: Ariel Elior <ariele@...adcom.com>
Date: Tue, 25 Feb 2014 16:41:07 +0000

>> -----Original Message-----
>> From: Michal Schmidt [mailto:mschmidt@...hat.com]
>> Sent: Tuesday, February 25, 2014 5:04 PM
>> To: davem@...emloft.net
>> Cc: netdev@...r.kernel.org; Ariel Elior; Dmitry Kravkov; Yuval Mintz
>> Subject: [PATCH net-next 0/3] bnx2x: minimize RAM usage in kdump
>> 
>> kdump kernels usually have only a small amount of memory reserved.
>> bnx2x can be memory-hungry. Let's minimize its memory usage when
>> running in kdump.
>> 
>> I detect kdump by looking at the "reset_devices" flag. A couple of
>> storage drivers (cciss, hpsa) use it for the same purpose. I am not sure
>> this is the best way to solve the problem, but it works.
>> 
>> Should it be made more generic by, say, looking at the total amount
>> of lowmem instead? Not using TPA by default when lowmem is small and/or
>> defaulting to fewer queues would help 32bit systems where a driver for
>> a multi-function multi-queue NIC can consume a significant amount
>> of available memory. Or do we want no such heuristics?
>> 
>> Is this something to consider doing for other network drivers too?
>> 
>> Michal Schmidt (3):
>>   bnx2x: clamp num_queues to prevent passing a negative value
>>   bnx2x: save RAM in kdump kernel by using a single queue
>>   bnx2x: save RAM in kdump kernel by disabling TPA
>> 
>>  drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c  | 12 ++++++++----
>>  drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |  2 ++
>>  2 files changed, 10 insertions(+), 4 deletions(-)
>> 
>> --
>> 1.8.5.3
> 
> This series looks good, in the sense that it modifies the driver in a correct way to achieve the intended result (less memory on kdump).
> The basic question of testing lowmem vs. reset_devices or perhaps some other parameter still needs to be answered though.
> Acked-by: Ariel Elior <ariele@...adcom.com>

Series applied, thanks.
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