On 2016-09-21 08:26, Anders Magnusson wrote:
Den 2016-09-20 kl. 23:55, skrev Johnny Billquist:On 2016-09-20 21:24, Anders Magnusson wrote:Den 2016-09-20 kl. 19:12, skrev Johnny Billquist:Hi, Ragge... Tried work that out many times, but never gotten far. You want console access to a hung or crashed system? :-)If you cannot get into DDB then something really evil has happened. Is this the case?No. Seems I must have really mis-stated this. The system hangs as in the OS stalls. The hardware is working fine, and I can break into DDB as well. If I were to make a guess, it appears that all processes that do disk I/O stalls. Other things continue running. But as most things touch disk sooner or later, pretty much everything draws to a standstill.You aere using MSCP, eh? I would take a guess of that it loses MSCP buffers somewhere then.
Yes, MSCP.Hmm... Loosing buffers. That's an interesting idea I hadn't considered. Could be.
Next time it happens, please get a process list (ps axl or from ddb) so we can get further on diagnosing it.
Sure. That is easy.
Massbus was always both more reliable and faster when I used it, but you don't have any 16-bit formatted RP07's, have you? :-)
We do. I used to run RP07 on our PDP-11/70. The problem is that we don't have any RH780. Also, you can reformat RP07s between 16-bit and 18-bit mode. Which is what I did when I hooked that one up to the 11/70.
We don't really have space in the hall for putting in RP07s though, and they are a bit small for NetBSD these days. Krille is using eight RA73 disks, at 2G each. Four of them are actually combined into one CCD disk.
Around 500 megs wont last long these days... :-)
Fixing BDPs would also help to improve Unibus speed I assume. That wouldn't be too much worw.
One potential issue is that the kernel is spending a damn large amount of time in the system these days. Performance is really sluggish, while the same hardware with another OS really performs much better.
Johnny
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