From owner-freebsd-arch@freebsd.org Sun Oct 6 03:37:15 2019 Return-Path: Delivered-To: freebsd-arch@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 4DC02F93DC for ; Sun, 6 Oct 2019 03:37:15 +0000 (UTC) (envelope-from rebecca@bsdio.com) Received: from muon.bsdio.com (muon.bluestop.org [65.103.231.193]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 46m8SB1X29z4Vhj for ; Sun, 6 Oct 2019 03:37:13 +0000 (UTC) (envelope-from rebecca@bsdio.com) Received: from muon.bsdio.com (localhost [127.0.0.1]) by muon.bsdio.com (Postfix) with ESMTP id F0D351D7FB; Sat, 5 Oct 2019 21:37:17 -0600 (MDT) Received: from muon.bsdio.com ([127.0.0.1]) by muon.bsdio.com (muon.bsdio.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id ZlO94pxNlozx; Sat, 5 Oct 2019 21:37:17 -0600 (MDT) Received: from [10.0.10.197] (unknown [10.0.10.197]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by muon.bsdio.com (Postfix) with ESMTPSA; Sat, 5 Oct 2019 21:37:17 -0600 (MDT) From: Rebecca Cran Mime-Version: 1.0 (1.0) Subject: Re: New CPUTYPE default for i386 port Date: Sat, 5 Oct 2019 21:37:04 -0600 Message-Id: <3E928CA4-91EF-47CF-9728-4E98789AC18E@bsdio.com> References: <201910060322.x963Mwo1065732@gndrsh.dnsmgr.net> Cc: Warner Losh , freebsd-arch@freebsd.org In-Reply-To: <201910060322.x963Mwo1065732@gndrsh.dnsmgr.net> To: "Rodney W. Grimes" X-Mailer: iPhone Mail (17A861) X-Rspamd-Queue-Id: 46m8SB1X29z4Vhj X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=none (mx1.freebsd.org: domain of rebecca@bsdio.com has no SPF policy when checking 65.103.231.193) smtp.mailfrom=rebecca@bsdio.com X-Spamd-Result: default: False [-2.22 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-0.87)[-0.874,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; RCVD_TLS_LAST(0.00)[]; DMARC_NA(0.00)[bsdio.com]; AUTH_NA(1.00)[]; URI_COUNT_ODD(1.00)[3]; NEURAL_HAM_LONG(-0.99)[-0.991,0]; RCVD_COUNT_THREE(0.00)[4]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_NA(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; ASN(0.00)[asn:209, ipnet:65.100.0.0/14, country:US]; MID_RHS_MATCH_FROM(0.00)[]; IP_SCORE(-2.76)[ip: (-8.82), ipnet: 65.100.0.0/14(-4.84), asn: 209(-0.08), country: US(-0.05)] Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Oct 2019 03:37:15 -0000 > On Oct 5, 2019, at 9:23 PM, Rodney W. Grimes wrote: >=20 > 586 =3D=3D Pentium I, almost all, if not all chipsets in the family suppor= t > 128MB, and many supported 192 to 512MB. Though many couldn=E2=80=99t cache more than 64MB.=20 =46rom https://www.vogonswiki.com/index.php/Socket_7_Builds =E2=80=9CIt's a common mistake to load up 430FX, 430VX and 430TX chip sets w= ith maximum amount of memory supported by the chipset. With these chip sets,= the use of more than 64MB of RAM results in a significant performance drop,= as memory bandwidth over 64MB is considerably reduced resulting in about 40= % system performance compared to working with L2-cached RAM. To avoid this, e= ither remove extra RAM, or change motherboard for a 430HX based one. If spec= ific applications require more RAM, it could be worthwhile to cover the RAM a= bove 64 MB when using DOS by loading a RAM drive to the remaining top memory= area. Some chip sets from other manufacturers are also known to cache more t= han 64 MB RAM.=E2=80=9D =E2=80=94=20 Rebecca Cran=