netdev - Re: /proc/net/sockstat invalid memory accounting or memory leak in latest kernels?

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Message-ID: <1405672897.10255.95.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 18 Jul 2014 10:41:37 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Fedoryshchenko <nuclearcat@...learcat.com>
Cc:	netdev@...r.kernel.org, kaber@...sh.net, davem@...emloft.net
Subject: Re: /proc/net/sockstat invalid memory accounting or memory leak in
 latest kernels?

On Fri, 2014-07-18 at 11:12 +0300, Denys Fedoryshchenko wrote:
> More updates. Now i found out how to see if tcp are under memory 
> pressure mode, i guess when it is active, speed might degrade. Now 
> almost all sockets are released, is it normal that tcp pressure still 
> "yes" ?
> 
> balancer-backup ~ # cat /proc/net/protocols
> protocol  size sockets  memory press maxhdr  slab module     cl co di ac 
> io in de sh ss gs se re sp bi br ha uh gp em
> PACKET    1216      0      -1   NI       0   no   kernel      n  n  n  n 
>   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
> ALG        624      0       0   NI       0   no   kernel      n  n  n  n 
>   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
> UNIX       832      1      -1   NI       0   yes  kernel      n  n  n  n 
>   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
> UDP-Lite   800      0      -1   NI       0   yes  kernel      y  y  y  n 
>   y  y  y  n  y  y  y  y  y  n  y  y  y  y  n
> PING       760      0      -1   NI       0   yes  kernel      y  y  y  n 
>   n  y  n  n  y  y  y  y  n  y  y  y  y  y  n
> RAW        768      0      -1   NI       0   yes  kernel      y  y  y  n 
>   y  y  y  n  y  y  y  y  n  y  y  y  y  n  n
> UDP        800      1       0   NI       0   yes  kernel      y  y  y  n 
>   y  n  y  n  y  y  y  y  y  n  y  y  y  y  n
> TCP       1608     24  1823119   yes    208   yes  kernel      y  y  y  
> y  y  y  y  y  y  y  y  y  y  n  y  y  y  y  y
> NETLINK    992      0      -1   NI       0   no   kernel      n  n  n  n 
>   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
> balancer-backup ~ # cat /proc/net/sockstat
> sockets: used 51
> TCP: inuse 21 orphan 13 tw 2 alloc 21 mem 1823120
> UDP: inuse 1 mem 0
> UDPLITE: inuse 0
> RAW: inuse 0
> FRAG: inuse 0 memory


tcp believes its under pressure because of some bug on accounting.

If you change /proc/sys/net/ipv4/tcp_mem   (3rd value), it might say it
is not under pressure.

I am taking a look, thanks again for the report.


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