On Tue, Oct 13, 2020 at 07:43:59AM -0700, Randy Dunlap wrote: > On 10/13/20 1:09 AM, Mike Rapoport wrote: > > On Mon, Oct 12, 2020 at 05:53:01PM +0800, Muchun Song wrote: > >> On Mon, Oct 12, 2020 at 5:24 PM Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote: > >>> > >>> On 10/12/20 10:39 AM, Muchun Song wrote: > >>>> On Mon, Oct 12, 2020 at 3:42 PM Eric Dumazet <edumazet@xxxxxxxxxx> wrote: > >> > >> We are not complaining about TCP using too much memory, but how do > >> we know that TCP uses a lot of memory. When I firstly face this problem, > >> I do not know who uses the 25GB memory and it is not shown in the /proc/meminfo. > >> If we can know the amount memory of the socket buffer via /proc/meminfo, we > >> may not need to spend a lot of time troubleshooting this problem. Not everyone > >> knows that a lot of memory may be used here. But I believe many people > >> should know /proc/meminfo to confirm memory users. > > > > If I undestand correctly, the problem you are trying to solve is to > > simplify troubleshooting of memory usage for people who may not be aware > > that networking stack can be a large memory consumer. > > > > For that a paragraph in 'man 5 proc' maybe a good start: > > > >>From ddbcf38576d1a2b0e36fe25a27350d566759b664 Mon Sep 17 00:00:00 2001 > > From: Mike Rapoport <rppt@xxxxxxxxxxxxx> > > Date: Tue, 13 Oct 2020 11:07:35 +0300 > > Subject: [PATCH] proc.5: meminfo: add not anout network stack memory > > consumption > > > > Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> > > --- > > man5/proc.5 | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/man5/proc.5 b/man5/proc.5 > > index ed309380b..8414676f1 100644 > > --- a/man5/proc.5 > > +++ b/man5/proc.5 > > @@ -3478,6 +3478,14 @@ Except as noted below, > > all of the fields have been present since at least Linux 2.6.0. > > Some fields are displayed only if the kernel was configured > > with various options; those dependencies are noted in the list. > > +.IP > > +Note that significant part of memory allocated by the network stack > > +is not accounted in the file. > > +The memory consumption of the network stack can be queried > > +using > > +.IR /proc/net/sockstat > > +or > > +.BR ss (8) > > .RS > > .TP > > .IR MemTotal " %lu" > > Hi Mike, > > Could you tell us what units those values are in? > or is that already explained somewhere else? It is described a few lines above and anyway, "MemTotal" is a part of the diff context ;-) > thanks. > -- > ~Randy > > -- Sincerely yours, Mike.
