linux-kernel - Re: epoll behaviour after running out of descriptors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 2 Nov 2008 11:27:40 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Olaf van der Spek <olafvdspek@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: epoll behaviour after running out of descriptors

On Sun, 2 Nov 2008, Olaf van der Spek wrote:

> On Sun, Nov 2, 2008 at 8:17 PM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > On Sun, 2 Nov 2008, Olaf van der Spek wrote:
> >
> >> On Sun, Nov 2, 2008 at 7:48 PM, Davide Libenzi <davidel@...ilserver.org> wrote:
> >> > Why don't you grep for TIME_WAIT?
> >>
> >> Because I don't have access to the test environment at the moment.
> >
> > Here:
> >
> > http://tinyurl.com/5ay86v
> 
> I know what TIME_WAIT is. I just think it's not applicable to this situation.

It is. You are saturating the port space, so no new POLLIN/accept events 
are sent (until some TIME_WAIT clears), so epoll_wait() returns nothing 
(or does not return, if INF timeo).
Keeping only 1K (if this is what you meant with your *only* 1K) 
connections *alive*, does not mean the trail that does moving 1K 
connections leave, is free.
If you ever played with things like httperf, you should know what I'm 
talking about.

- Davide

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/