Painfully slow compilation (read: "make buildworld buildkernel") on not-so-weak system
Lev Serebryakov
lev at FreeBSD.org
Sat Dec 8 12:19:01 UTC 2018
Hello Lev,
Saturday, December 8, 2018, 2:13:03 PM, you wrote:
> Another strange thing I noticed: when system is in such state, "top -SH"
> shows that sometimes very low-profile processes, like clock software
> interrupt (!) could consume large amount of CPU for short periods time. When
> system is idle there never will be "intr{swi4: clock (0)}" consuming 55% CPU
> for one "frame" or sshd, or screen itself.
Like this. This system doesn't have any significant network traffic now —
only one ssh connection, which is used as console. And 62.3% for network
card. WTF?!
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
20128 root 101 0 104M 74M CPU1 1 0:31 100.00% cc
0 root -76 - 0 4608K - 2 53:25 62.23% kernel{if_config_tqg_0}
11 root -60 - 0 240K WAIT 0 25:45 24.89% intr{swi4: clock (0)}
9 root -8 - 0 160K tx->tx 0 7:38 24.88% zfskern{txg_thread_enter}
995 root 24 0 17M 7676K select 1 2:20 12.44% sendmail
13791 root 24 0 24M 15M select 0 0:04 12.44% make
--
Best regards,
Lev mailto:lev at FreeBSD.org
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