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  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Sat, 10 Nov 2012 21:02:02 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Krzysztof Mazur <krzysiek@...lesie.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chas Williams - CONTRACTOR <chas@....nrl.navy.mil>,
	davem@...emloft.net
Subject: Re: [PATCH v3 8/7] pppoatm: fix missing wakeup in pppoatm_send()

On Sat, 2012-11-10 at 21:23 +0100, Krzysztof Mazur wrote:
> With this tasklet_schedule() we implement a "spin_lock" here, but in
> this case both conditions (vcc not ready and socket locked) can be
> true for a long time and we can spin here for a long time. I confirmed
> it by reverting patch 1 (atm: detach protocol before closing vcc) and
> now I have 50% of CPU used by ksoftirqd and 50% by pppd (UP system).

Ah, thanks.

Can we take the lock in the tasklet, so we wait for it instead of
spinning?

-- 
dwmw2


Download attachment "smime.p7s" of type "application/x-pkcs7-signature" (6171 bytes)

Powered by blists - more mailing lists