netdev - Re: [PATCH net] bna: page allocation during interrupts to use a mempool.

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Date:	Wed, 8 Oct 2014 17:46:03 -0700 (PDT)
From:	Eric Wheeler <netdev@...ts.ewheeler.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Shahed Shaikh <shahed.shaikh@...gic.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	netdev <netdev@...r.kernel.org>,
	Rasesh Mody <rasesh.mody@...gic.com>
Subject: Re: [PATCH net] bna: page allocation during interrupts to use a
 mempool.

>>> Further inspection of the driver told me that unmap->vector.len should
>>> be 16384 already. (same than PAGE_SIZE << 2)
>>> (set at line 304, drivers/net/ethernet/brocade/bna/bnad.c)
>>>
>>> So you might hit memory fragmentation issues.
>>>
>>> Do you have CONFIG_COMPACTION=y in your .config ?
>>
>> We're still having the backtrace.
>
> What is the output of
>
> free
> cat /proc/sys/vm/min_free_kbytes
> cat /proc/buddyinfo


[root@hv2 ~]# cat /proc/sys/vm/min_free_kbytes
262144

[root@hv2 ~]# cat /proc/buddyinfo
Node 0, zone      DMA      1      2      1      1      1      1      1      0      1      1      3
Node 0, zone    DMA32   2221  28306    771   2964    148      9      4      1      0      0      1
Node 0, zone   Normal 956207  99272      0      0      0      0      0      0      0      0      1

[root@hv2 ~]# free
              total       used       free     shared    buffers     cached
Mem:      33051552   28058192    4993360          0    3058040     158224
-/+ buffers/cache:   24841928    8209624
Swap:      8388604      21540    8367064

[root@hv2 ~]# free -m
              total       used       free     shared    buffers     cached
Mem:         32276      27401       4875          0       2986        154
-/+ buffers/cache:      24260       8016
Swap:         8191         21       8170

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