Date: Sun, 24 Sep 2000 11:30:08 -0700 From: Alfred Perlstein <bright@wintelcom.net> To: Dag-Erling Smorgrav <des@ofug.org> Cc: Warner Losh <imp@village.org>, The Hermit Hacker <scrappy@hub.org>, Bruce Evans <bde@zeta.org.au>, freebsd-current@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG Subject: Re: 'interrupt-level buffer overflows' for sio device? Message-ID: <20000924113008.N9141@fw.wintelcom.net> In-Reply-To: <xzp7l817ij1.fsf@flood.ping.uio.no>; from des@ofug.org on Sun, Sep 24, 2000 at 08:26:58PM %2B0200 References: <Pine.BSF.4.21.0009080008090.527-100000@thelab.hub.org> <200009080314.VAA50701@harmony.village.org> <xzp7l817ij1.fsf@flood.ping.uio.no>
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* Dag-Erling Smorgrav <des@ofug.org> [000924 11:27] wrote: > Warner Losh <imp@village.org> writes: > > In message <Pine.BSF.4.21.0009080008090.527-100000@thelab.hub.org> The Hermit Hacker writes: > > : Okay, I'm a little confused here ... from what I'm reading/following, this > > : isn't a new problem ... or is it? If not, why has it suddenly manifested > > : itself with the new SMP code? > > It seems to be new with the SMP code. At least that's what my reading > > of the original message is. > > I'm seeing the same thing as Marc, but I have a little more info: > > 1) it started after the SMPng commit. > > 2) it's not just sio, it's everything: > > - interactive response is markedly slower. > > - the keyboard autorepeats slower than it used to (even with > kbdcontrol -r fast). > > - I/O bound processes such as mpg123 or cvsup will pause briefly > when there is other I/O going on (moving the mouse, typing fast, > holding down a key on the keyboard), which they didn't use to. This is basically a result of the entire kernel running at the equivelant of splhigh, all interrupts are blocked until a context switch in kernel land. There's work in progress to mpsafe the drivers (at least for ethernet, more will arrive later). -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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