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

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Message-ID: <f55850a70611062200x764bf09fkbbaeb61e66138c91@mail.gmail.com>
Date:	Tue, 7 Nov 2006 14:00:00 +0800
From:	"Zhao Xiaoming" <xiaoming.nj@...il.com>
To:	linux-kernel@...r.kernel.org,
	"Linux Netdev List" <netdev@...r.kernel.org>
Subject: Re: ZONE_NORMAL memory exhausted by 4000 TCP sockets

The latest update:
    It seems that Linux kernel memory management mechanisms including
buddy and slab algorisms are not very efficient under my test
conditions that tcp stack requires a lot of (hundreds of MB) packet
buffers and release them very frequently.
    Here is the proof. After change my kernel configuration to support
2/2 VM splition, LOMEM consumption reduced to 270M bytes compared with
640M bytes of the 1/3 kernel. All test conditions are the same and
memory pages allocated by TCP stack are also the same, 34K ~ 38K
pages. In other words, 'lost' memory changed from ~500M to ~130M.
Thus, I have nothing to do but guessing the much more free pages make
the slab/buddy algorisms more efficient and waste less memory.
    Finally I got what I want. Thank you all for your help and advices.

Xiaoming.
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