Date: Wed, 14 Aug 1996 09:04:31 -0600 (MDT) From: Nate Williams <nate@mt.sri.com> To: Michael Smith <msmith@atrad.adelaide.edu.au> Cc: ponds!rivers@dg-rtp.dg.com (Thomas David Rivers), sag.space.lockheed.com!handy@dg-rtp.dg.com, ponds!rivers@freefall.freebsd.org, freebsd-hackers@freefall.freebsd.org Subject: Re: sio issues (silo overflows on a pentium, locked in ttywait, etc...) Message-ID: <199608141504.JAA27060@rocky.mt.sri.com> In-Reply-To: <199608140601.PAA29529@genesis.atrad.adelaide.edu.au> References: <199608140307.XAA03390@lakes> <199608140601.PAA29529@genesis.atrad.adelaide.edu.au>
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> If this is bothering you, and you are completely up to date, then > I or someone better qualified will be more than happy to help you > chase down the problem. If you aren't, come back when you've upgraded > to 2.1.5 and are still having the same problem. I'm using *stock* National 16550A UARTS on my 486/66, and when I upgraded to 2.1.5 I started seeing them and I *NEVER* saw them before on any previous release of FreeBSD. These are not clones, these are actual National parts bought a long time ago, and up till recently I never saw any overflows with them. Now, why I'm seeing this I don't know, but I think I remember Bruce mentioning that there were changes made to the driver to actually do better reporting, so in the past I may have had overflows but they weren't reported. What I did last night was change my trigger level on my UART from 14 -> 8, but I haven't tried out the new kernel to see if that helps. > The fact that you're the only person seeing this makes me wonder whether > you have funny serial hardware causing your problems. Note that lots of > PC serial hardware is _really_bad_, so this is actually fairly likely. He's not the only one seeing it. Lots of other folks see it as well, but since it doesn't affect anything they ignore it like I do. BTW, I'm getting 11K/sec using modem compression on text files, and around 3.4K/sec on compressed files SLIP host<-> SLIP host, so I really don't see the overflows affecting me much. The funny thing is I don't see overflows on the SLIP server box which is also running 16550A UARTS and is running multiple sessions, but it's not running X and never touches the hard disk. (Basically it's the same hardware on both boxes, 486/66 with 16MB, although my box has an Adaptec 1542B and the server box is IDE). Nate
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