user/dev discussion of public-inbox itself
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From: Eric Wong <e@80x24.org>
To: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Cc: meta@public-inbox.org
Subject: httpd 502s [was: trying to figure out 100% CPU usage in nntpd...]
Date: Wed, 11 Sep 2019 02:22:15 +0000	[thread overview]
Message-ID: <20190911022215.GA309@dcvr> (raw)
In-Reply-To: <20190910181224.urhyoo6av7mhjs67@dcvr>

Btw, some of the changes in public-inbox to use EPOLLET /
EPOLLONESHOT would make it more sensitive to kernel bugs,
and missed wakeups could cause resource exhaustion...

I just noticed this now:
https://lore.kernel.org/lkml/20190904175303.918854334@linuxfoundation.org/

And I remember I found another mm-compaction-related issue
several years back (early 3.x) which caused epoll wakeups to be
missed...

  reply	other threads:[~2019-09-11  2:22 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-08 10:45 [PATCH] nntp: regexp always consumes rbuf if "\n" exists Eric Wong
2019-09-08 10:52 ` trying to figure out 100% CPU usage in nntpd Eric Wong
2019-09-09 10:05   ` Konstantin Ryabitsev
2019-09-09 17:53     ` Eric Wong
2019-09-10  8:38       ` Konstantin Ryabitsev
2019-09-10 18:12         ` Eric Wong
2019-09-11  2:22           ` Eric Wong [this message]
2019-09-11 10:24             ` httpd 502s [was: trying to figure out 100% CPU usage in nntpd...] Konstantin Ryabitsev
2019-09-11 17:12               ` Eric Wong
2019-09-11 17:36                 ` Konstantin Ryabitsev
2019-09-12  0:05                   ` Eric Wong
2019-09-12  2:49                     ` Eric Wong
2019-09-12  8:35                       ` Eric Wong
2019-09-12 11:37                         ` Konstantin Ryabitsev
2019-09-13  3:12                           ` Eric Wong
2019-09-13  7:03                             ` Eric Wong
2019-09-13  9:01                             ` Eric Wong
2019-09-13 18:07                             ` Konstantin Ryabitsev
2019-09-14  5:25                               ` Eric Wong
2019-09-11  9:44           ` trying to figure out 100% CPU usage in nntpd Konstantin Ryabitsev
2019-09-11 17:12             ` Eric Wong

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