Date: Sun, 25 Jun 2000 10:41:57 -0700 From: Julian Elischer <julian@elischer.org> To: Jason Evans <jasone@canonware.com> Cc: smp@freebsd.org Subject: Re: SMP meeting summary Message-ID: <39564465.794BDF32@elischer.org> References: <20000624235605.D8965@blitz.canonware.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Jason Evans wrote:
> - Netgraph poses locking performance problems, since locks have to be
> released at multiple potential transfer points, regardless of whether
> Netgraph is in use. This problem also exists with System V STREAMS.
> During the meeting we didn't come to a clear consensus on how much of
> a problem this really is.
>
I think this is a mis-stated issue.
There is no REQUIREMENT that locks be released
or held at every transfer between modules.
While it is the case that some modules may require
locking operations, it cannot be said that there is a 1:1
correspondence between locks and modules.
A packet could wuite easily travel thought quite
a number of modules without any additional locking work.
Many modules would have no resources worth protecting..
(at least in the common case)
--
__--_|\ Julian Elischer
/ \ julian@elischer.org
( OZ ) World tour 2000
)_.---._/ presently in: Budapest
v
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-smp" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?39564465.794BDF32>