netdev - Issue with /proc/sys/net/ipv4/tcp

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Message-ID: <561B7F98.1040809@huawei.com>
Date:	Mon, 12 Oct 2015 17:38:32 +0800
From:	wangyufen <wangyufen@...wei.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	<netdev@...r.kernel.org>
Subject: Issue with /proc/sys/net/ipv4/tcp_mem

Hi,

I tried on linux-4.1:
    linux:~# cat /proc/sys/net/ipv4/tcp_mem 
    8388608	12582912	16777216
    linux:~# echo 1234 >/proc/sys/net/ipv4/tcp_mem 
    -bash: echo: write error: Invalid argument
    linux:~# cat /proc/sys/net/ipv4/tcp_mem 
    1234	12582912	16777216

the echo operation got error, but value already written to tcp_mem.

I checked, patch f594d63199688ad568fb caused the issue.

thanks,
Wang

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