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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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