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Message-ID: <CANn89i+jYSfpeZGT94DDc5vcuHouyfaq+ZWu6eE3dJGykpgZVw@mail.gmail.com>
Date: Wed, 3 Jan 2024 17:48:41 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Sitnicki <jakub@...udflare.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	kernel-team@...udflare.com
Subject: Re: [PATCH net-next 0/2] tcp/dccp: refine source port selection

On Wed, Jan 3, 2024 at 3:19 PM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> On Thu, Dec 14, 2023 at 07:29 PM GMT, Eric Dumazet wrote:
> > This patch series leverages IP_LOCAL_PORT_RANGE option
> > to no longer favor even source port selection at connect() time.
> >
> > This should lower time taken by connect() for hosts having
> > many active connections to the same destination.
> >
> > Eric Dumazet (2):
> >   inet: returns a bool from inet_sk_get_local_port_range()
> >   tcp/dccp: change source port selection at connect() time
> >
> >  include/net/ip.h                |  2 +-
> >  net/ipv4/inet_connection_sock.c | 21 ++++++++++++++++-----
> >  net/ipv4/inet_hashtables.c      | 27 ++++++++++++++++-----------
> >  3 files changed, 33 insertions(+), 17 deletions(-)
>
> This is great. Thank you.
>
> # sysctl net.ipv4.ip_local_port_range
> net.ipv4.ip_local_port_range = 32768    60999
> # { sleep 3; stress-ng --sockmany 1 --sockmany-ops 20000; } & \
> > /usr/share/bcc/tools/funclatency inet_hash_connect
> [1] 240
> Tracing 1 functions for "inet_hash_connect"... Hit Ctrl-C to end.
> stress-ng: info:  [243] defaulting to a 1 day, 0 secs run per stressor
> stress-ng: info:  [243] dispatching hogs: 1 sockmany
> stress-ng: info:  [243] skipped: 0
> stress-ng: info:  [243] passed: 1: sockmany (1)
> stress-ng: info:  [243] failed: 0
> stress-ng: info:  [243] metrics untrustworthy: 0
> stress-ng: info:  [243] successful run completed in 27.60 secs
> ^C
>      nsecs               : count     distribution
>          0 -> 1          : 0        |                                        |
>          2 -> 3          : 0        |                                        |
>          4 -> 7          : 0        |                                        |
>          8 -> 15         : 0        |                                        |
>         16 -> 31         : 0        |                                        |
>         32 -> 63         : 0        |                                        |
>         64 -> 127        : 0        |                                        |
>        128 -> 255        : 0        |                                        |
>        256 -> 511        : 0        |                                        |
>        512 -> 1023       : 511      |**                                      |
>       1024 -> 2047       : 8698     |****************************************|
>       2048 -> 4095       : 2870     |*************                           |
>       4096 -> 8191       : 1471     |******                                  |
>       8192 -> 16383      : 389      |*                                       |
>      16384 -> 32767      : 114      |                                        |
>      32768 -> 65535      : 43       |                                        |
>      65536 -> 131071     : 15       |                                        |
>     131072 -> 262143     : 0        |                                        |
>     262144 -> 524287     : 1        |                                        |
>     524288 -> 1048575    : 1        |                                        |
>    1048576 -> 2097151    : 3        |                                        |
>    2097152 -> 4194303    : 1609     |*******                                 |
>    4194304 -> 8388607    : 4272     |*******************                     |
>    8388608 -> 16777215   : 4        |                                        |
>
> avg = 1314821 nsecs, total: 26297744706 nsecs, count: 20001
>
> Detaching...
> [1]+  Done                    { sleep 3; stress-ng --sockmany 1 --sockmany-ops 20000; }
> # { sleep 3; LD_PRELOAD=./setsockopt_ip_local_port_range.so stress-ng --sockmany 1 --sockmany-ops 20000; } & \
> > /usr/share/bcc/tools/funclatency inet_hash_connect
> [1] 246
> Tracing 1 functions for "inet_hash_connect"... Hit Ctrl-C to end.
> stress-ng: info:  [249] defaulting to a 1 day, 0 secs run per stressor
> stress-ng: info:  [249] dispatching hogs: 1 sockmany
> stress-ng: info:  [249] skipped: 0
> stress-ng: info:  [249] passed: 1: sockmany (1)
> stress-ng: info:  [249] failed: 0
> stress-ng: info:  [249] metrics untrustworthy: 0
> stress-ng: info:  [249] successful run completed in 1.01 secs
> ^C
>      nsecs               : count     distribution
>          0 -> 1          : 0        |                                        |
>          2 -> 3          : 0        |                                        |
>          4 -> 7          : 0        |                                        |
>          8 -> 15         : 0        |                                        |
>         16 -> 31         : 0        |                                        |
>         32 -> 63         : 0        |                                        |
>         64 -> 127        : 0        |                                        |
>        128 -> 255        : 0        |                                        |
>        256 -> 511        : 0        |                                        |
>        512 -> 1023       : 2085     |******                                  |
>       1024 -> 2047       : 13401    |****************************************|
>       2048 -> 4095       : 3877     |***********                             |
>       4096 -> 8191       : 561      |*                                       |
>       8192 -> 16383      : 60       |                                        |
>      16384 -> 32767      : 16       |                                        |
>      32768 -> 65535      : 2        |                                        |
>
> avg = 1768 nsecs, total: 35376609 nsecs, count: 20002
>
> Detaching...
> [1]+  Done                    { sleep 3; LD_PRELOAD=./setsockopt_ip_local_port_range.so stress-ng --sockmany 1 --sockmany-ops 20000; }
> # cat ./setsockopt_ip_local_port_range.c
> #include <dlfcn.h>
> #include <linux/in.h>
> #include <sys/socket.h>
>
> int socket(int domain, int type, int protocol)
> {
>         int (*socket_fn)(int, int, int) = dlsym(RTLD_NEXT, "socket");
>         int fd;
>
>         fd = socket_fn(domain, type, protocol);
>         if (fd < 0)
>                 return -1;
>
>         if (domain == AF_INET || domain == AF_INET6) {
>                 setsockopt(fd, IPPROTO_IP, IP_LOCAL_PORT_RANGE,
>                            &(__u32){ 0xffffU << 16 }, sizeof(__u32));
>         }
>
>         return fd;
> }
> #

Nice tests, thanks for them !

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