Date: Thu, 16 Jun 2005 17:46:03 +0800 From: Jiawei Ye <leafy7382@gmail.com> To: delphij@delphij.net Cc: freebsd-current@freebsd.org Subject: Re: Recent VFS locking vs kqueue Message-ID: <c21e92e205061602464bdf1fba@mail.gmail.com> In-Reply-To: <1118912651.860.17.camel@spirit> References: <1118912651.860.17.camel@spirit>
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On 6/16/05, Xin LI <delphij@frontfree.net> wrote:
> Hi, Jeff and -current@,
>
> With a fresh -CURRENT kernel (today's source) I got the following
> messages from console and /var/log/messages on my laptop, with a "cvs -R
> up -PdA 2>/dev/null" running on one console (which results in disk/fs
> activities) and "tail -F /var/log/messages" (which uses kqueue events).
>
> The kernel is built with ULE scheduler, PREEMPTION+FULL_PREEMPTION
> enabled, and all debugging options, like INVARIANTS and WITESS turned
> on.
>
> BTW. I have found something that can lead to panic: Negative nice
> count, which indicates that there are some races in our code, but it
> seems that the bug is not easy to exercise. Will report more
> information/patches once I got some findings.
>
> Thanks in advance!
Perhaps you could try compling Apache2 with KQUEUE and THREADS
support, then try exercise the httpd server with 'webbench -c 1000'. I
got several panics (alas, not dump available) during the last week
with such setup. After turning off KQUEUE and THREADS support in
Apache2, things calmed down.
Jiawei
--
"Without the userland, the kernel is useless."
--inspired by The Tao of Programming
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