Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!haven!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: Re: more on Ultrix 2.0 / Emulex disk throughput
Keywords: MicrovaxII, Ultrix 1.1, 2.0, Emulex QD controllers
Message-ID: <13471@mimsy.UUCP>
Date: 9 Sep 88 20:30:36 GMT
References: <3591@phoenix.Princeton.EDU> <615@hscfvax.harvard.edu> <3613@phoenix.Princeton.EDU>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 30

>>In article <615@hscfvax.harvard.edu> pavlov@hscfvax.harvard.edu
>>(G.Pavlov) writes:
>>The problem appears to be that DEC decreased the timeout interval on disk
>>requests. ...

In article <3613@phoenix.Princeton.EDU> paul@phoenix.Princeton.EDU
(Paul Lansky) writes:
>Can anyone tell me where this timeout occurs? Is it in the uda driver?
>its stragegy, start, or interrupt routine?

I rather doubt it.  There is, however, a field in the MSCP `Set Controller
Characteristics' packet called `hosttimo'.  This is the only `timeout' I
know about.  The SCC variant (called, I think, SETCHR in the Ultrix driver)
is structured as:

struct mscpv_sccc {
	u_short sccc_version;		/* MSCP version number */
	u_short sccc_ctlrflags;		/* controller flags */
	u_short sccc_hosttimo;		/* host timeout */
	u_short sccc_usefrac;		/* use fraction */
	long	sccc_time;		/* time and date */
	long	sccc_xxx1;	/* ? */
	long	sccc_errlgfl;	/* ? */
	short	sccc_xxx2;	/* ? */
	short	sccc_copyspd;	/* ? */
};

I would like to know what the `?' fields are for. . . .
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris