Date: Tue, 20 Apr 2004 17:57:50 +0300 From: Rumen Telbizov <altares@e-card.bg> To: Pete French <petefrench@keithprowse.com> Cc: stable@freebsd.org Subject: Re: HTT and SMP question Message-ID: <20040420145750.GA32493@e-card.bg> In-Reply-To: <E1BFvbu-0000iO-EQ@dilbert.firstcallgroup.co.uk> References: <20040420073837.GS32493@e-card.bg> <E1BFvbu-0000iO-EQ@dilbert.firstcallgroup.co.uk>
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On Tue, Apr 20, 2004 at 02:48:26PM +0100, Pete French wrote: > > Would you please point out some cases when HTT with machdep.hlt_logical_cpus=0 > > causes worse performance than machdep.hlt_logical_cpus=1? > > Doing a large 'make' does it for me - small difference, but measurable. > I get the best poerformance by compiling out SMP alltogether though. > As my machine spends most of its time doing 'make' then for me it's worth Ok > removing it entirely (aside from the fact that my machine isnt stable > under HTT) I have a single Xeon 2.66 on a dual processor board and I did recompile the kernel with SMP support in first place! HTT is enabled by default! With these 2 things in mind - the box is rock solid for over 2 weeks with average load. I am not sure about _how much_ faster it is with HTT (and machdep.hlt_logical_cpus=0) but at least it IS stable! The OS is 4.9-STABLE (cvsuped 1 week ago). Are you sure that exactly the HTT is causing you the instabillity problems ? Regards Rumen Telbizov
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