linux-kernel - Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets

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Date:	Mon, 6 Nov 2006 09:48:42 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	"Zhao Xiaoming" <xiaoming.nj@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets

On Monday 06 November 2006 09:10, Zhao Xiaoming wrote:
>
> Thanks for the answer. I know it's more likely relats to netdev.
> However, it's always a strange thing to have 400~500M bytes LOWMEM
> 'gone' while it's not reported to be occupied by slab. Both meminfo
> and buddyinfo tell the same.
>
> with traffics of 2000 concurrent sessions:

Slab:           293952 kB
So 292 MB used by slab for 2000 sessions.

Expect 600 MB used by slab for 4000 sessions.

So your precious LOWMEM is not gone at all. It *IS* used by SLAB.

You forgot to send 
cat /proc/slabinfo

>
> cat /proc/meminfo
> MemTotal:      4136580 kB
> MemFree:       3298460 kB
> Buffers:          4096 kB
> Cached:          21124 kB
> SwapCached:          0 kB
> Active:          47416 kB
> Inactive:        12532 kB
> HighTotal:     3276160 kB
> HighFree:      3214592 kB
> LowTotal:       860420 kB
> LowFree:         83868 kB
> SwapTotal:           0 kB
> SwapFree:            0 kB
> Dirty:              12 kB
> Writeback:           0 kB
> Mapped:          42104 kB
> Slab:           293952 kB
> CommitLimit:   2068288 kB
> Committed_AS:    58892 kB
> PageTables:       1112 kB
> VmallocTotal:   116728 kB
> VmallocUsed:      2940 kB
> VmallocChunk:   110548 kB
> HugePages_Total:     0
> HugePages_Free:      0
> Hugepagesize:     2048 kB
>
>
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