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

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Message-ID: <87io6coxg1.fsf@x220.int.ebiederm.org>
Date:	Mon, 12 Oct 2015 11:37:02 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	wangyufen <wangyufen@...wei.com>
Cc:	<netdev@...r.kernel.org>
Subject: Re: Issue with /proc/sys/net/ipv4/tcp_mem

wangyufen <wangyufen@...wei.com> writes:

> 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.

If your problem is that you can not write a single value and instead
have to write all three values I don't know what to tell you.  I don't
see how that could have ever worked.

Certainly the commit you pointed at did not change that behavior.

Eric
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