Date: Mon, 13 Nov 1995 17:37:58 -0500 From: Charles Henrich <henrich@crh.cl.msu.edu> To: terry@lambert.org, freebsd-current@freebsd.org Subject: Re: ISP state their FreeBSD concerns Message-ID: <199511132237.RAA17770@crh.cl.msu.edu> References: <48839e$nhm@msunews.cl.msu.edu>
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In lists.freebsd.current you write:
>> > 1. A concern that FreeBSD tends to "bind" for brief periods when
>> > loaded...
>>
>> Can this is an IDE issue? I never saw anything like this until
>> I configured an IDE mail server. That system pauses for seconds
>> sometimes, and then continues. This is running -stable, syscons
>> only (no X), no messages logged, etc. The echo stops going to
>> the display, the ethernet activity is stopped, all in all it seems
>> to be locked up for three or four seconds.
>>
>> We have three SCSI only systems and haven't ever seen this, and
>> one IDE system that pauses.
>I have seen pauses on the order of a second or two on a SCSI system
>with PCI + NCR controller.
>Typically, there are no console messages associated, as one would
>expect with timeouts (which the IDE theory implies).
>When the pauses start happening, they will continue happening with
>a moderate frequency. Typing "sync" will cure the problem for a short
>period of time, after which it will recurr. Generally, I type "sync"
>often enough from my V6 background that it doesn't hit me. When it
>does, it's obvious.
A couple of months back Matt Dillion was here (-hackers actually) talking about
this same (similar?) problem which he had tracked down to the VM system, and
even provided a solution, that seems to have been sat on. Matt is a really
really sharp guy, perhaps we should take a closer look at what he has done?
-Crh
--
Charles Henrich Michigan State University henrich@crh.cl.msu.edu
http://rs560.msu.edu/~henrich/
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