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bpftune uses BPF to auto-tune Linux systems
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negative value for "net.ipv4.tcp_rmem" max #36

Closed gecon closed 1 year ago

gecon commented 1 year ago

Tuning of "net.ipv4.tcp_rmem" max is showing some negative values (an overflow?).

Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:49 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:49 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput
Jul 14 04:14:50 hostname bpftune[1237369]: Due to need to increase max buffer size to maximize throughput change net.ipv4.tcp_rmem(min default max) from (4096 87380 1734723440) -> (4096 87380 -2126562996)
Jul 14 04:14:50 hostname bpftune[1237369]: Scenario 'need to increase TCP buffer size(s)' occurred for tunable 'net.ipv4.tcp_rmem' in global ns. Need to increase buffer size(s) to maximize throughput

OS/Kernel info:


[root@hostname~]# cat /etc/oracle-release
Oracle Linux Server release 8.8
[root@hostname ~]# uname -a
Linux hostname 5.4.17-2136.318.7.1.el8uek.x86_64 #2 SMP Thu Apr 13 17:33:39 PDT 2023 x86_64 x86_64 x86_64 GNU/Linux
alan-maguire commented 1 year ago

thanks for the report! should be fixed by #38

gecon commented 1 year ago

That was fast! Thanks! 👍

alan-maguire commented 1 year ago

this issue should be resolved by #38 ; closing for now but if you still see it feel free to reopen. thanks!