From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id 8f11e6e4 for ; Fri, 22 Nov 2019 03:24:52 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id 4C9499C15D; Fri, 22 Nov 2019 13:24:50 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id C4FB093D71; Fri, 22 Nov 2019 13:24:21 +1000 (AEST) Authentication-Results: minnie.tuhs.org; dkim=pass (2048-bit key; unprotected) header.d=bsdimp-com.20150623.gappssmtp.com header.i=@bsdimp-com.20150623.gappssmtp.com header.b="1l9xOVY1"; dkim-atps=neutral Received: by minnie.tuhs.org (Postfix, from userid 112) id EA19193D71; Fri, 22 Nov 2019 13:24:17 +1000 (AEST) Received: from mail-qt1-f180.google.com (mail-qt1-f180.google.com [209.85.160.180]) by minnie.tuhs.org (Postfix) with ESMTPS id 1846B93D59 for ; Fri, 22 Nov 2019 13:24:17 +1000 (AEST) Received: by mail-qt1-f180.google.com with SMTP id 59so739538qtg.8 for ; Thu, 21 Nov 2019 19:24:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=VFNyTJOzljCWrDy5zkioZi+K+vRd6SYd6V+GMS76Uyg=; b=1l9xOVY1zZ9aNNZYKrkjyWWdKjxotuxGz/HTYhfVLsjVA7w+AIDiXNqgGDiGhzb8Dp eOMfVR5nr55GPZ5gZ3BOb/48dpQmakzl06NMOW7melK2Pt68WACdpdHWLK2MkWMBiZK3 3EQYl0XNRaXWWA2FUW2jHpXiet6nNXjWPESYSv/SRMlCzQqfoHxqmIV1N1wG2e2dWGym ZOSZq73nZOyE3auaCHf1T31t398j4E0V8ocQ9EzL8E+t53VMl/aJegBBWna0iCW6j/7a rS+mQTw5zBrP6o/qV3jgtfbxj01rnMGisa6+eDtt2xxHadDoWochGNAFbBszA2RLldDZ kLfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=VFNyTJOzljCWrDy5zkioZi+K+vRd6SYd6V+GMS76Uyg=; b=l81nzNdJK4OK4BD7Fg1XpnmqwCptgp+eY/QNfweWOF2xcPx38UmuIDX+4+lNbMT+Gy s77i6NrwxQ99GtaxpiM4hmM4E/wXQd2UD6JLR4jMcp3k/GLFqhVMeBZv0h/yDgUpaQ1v UG49M8WFIiAqcPkm1BJCUJB/C6IWzYkaGJIULPFQgkTc4vWLjRLXMCiyhz9O8UwoS8nz 4wfrGMZlnLs5ixDsOPy4OoLbX/S9XEsUde+KFss/pJBPLhjt9W0B0OuPAKCgcidoUO/m u2ZNfJi3OiVb5c4S+2E8HQIXuoNz/NydhbU94W/L3Lzjdzv1tj+sSvsckNb+p3BP4H+O CxBw== X-Gm-Message-State: APjAAAWnrWirHStpfZBIZsPSB6zmbD6cdwDe9KV6C2WIqS1NQ9/Ya6li DC55HaMlIxzUOtdk6bViXE0le5CG4uLlRrkG/uZgSg== X-Google-Smtp-Source: APXvYqyK2aehbW2GlVlMC6E21GZoXH+Uxb9OPiGVs3AhSP0WAIOZe1ezis45cC1j6hKLdCS6d/IUnsGL1Q6XToaDskg= X-Received: by 2002:aed:3be9:: with SMTP id s38mr12329869qte.175.1574393056038; Thu, 21 Nov 2019 19:24:16 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Warner Losh Date: Thu, 21 Nov 2019 20:24:04 -0700 Message-ID: To: ron minnich Content-Type: multipart/alternative; boundary="000000000000d7ab990597e6f22b" Subject: Re: [TUHS] Irix on MIPS -- was kernel mode paged X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: TUHS main list Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" --000000000000d7ab990597e6f22b Content-Type: text/plain; charset="UTF-8" On Thu, Nov 21, 2019, 2:12 PM ron minnich wrote: > I'm looking for a reference to any Unix ports where the kernel ran in > a non-paged address space and user mode was paged. I could swear this > was done at some point, and memory says it was on a soft-TLB system > like the MIPS, to avoid TLB pollution and TLB fault overhead. > > But maybe I'm nuts. I am happy to hear either answer. > Mips had KSEG0 which didn't go through TLB and was mapped to physical memory. Some MIPS kernels ran in this space to avoid TLB issues... Warner > --000000000000d7ab990597e6f22b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Thu, Nov 21, 2019, 2:12 PM ron minnich <rminnich@gmail.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">I'm looking for a reference to any Unix p= orts where the kernel ran in
a non-paged address space and=C2=A0 user mode was paged. I could swear this=
was done at some point, and memory says it was on a soft-TLB system
like the MIPS, to avoid TLB pollution and TLB fault overhead.

But maybe I'm nuts. I am happy to hear either answer.
<= /div>

Mips had KSEG0 whi= ch didn't go through TLB and was mapped to physical memory.=C2=A0 Some = MIPS kernels ran in this space to avoid TLB issues...

Warner
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