Date: Thu, 10 Jul 1997 10:26:44 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: joerg_wunsch@uriah.heep.sax.de Cc: hackers@FreeBSD.ORG Subject: Re: no SYSVSHM in GENERIC now.. Message-ID: <199707100826.KAA05398@labinfo.iet.unipi.it> In-Reply-To: <19970710092221.JN34121@uriah.heep.sax.de> from "J Wunsch" at Jul 10, 97 09:22:02 am
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> As Andrew Atrens wrote: > > > Does the X-server run any faster with MIT-SHM than without? > > No, it doesn't. The only thing is that it disables the MIT-SHM > extension if no SYSVSHM is available in the kernel (it catches SIGSYS, > and attempts to issue a shmget() call). > > MIT-SHM is an extension that must be explicitly used by the clients, > and AFAIK only few clients actually use it. It is not to be confused "tv" and friends seem to run a bit faster with MITSHM since they probably save one copy. Of course it is much faster to let the frame grabber dump data straight to the video card. Cheers Luigi
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