From nobody Fri Apr 07 19:08:04 2023 X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4PtSZB2Gslz4431H for ; Fri, 7 Apr 2023 19:08:18 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-ej1-x634.google.com (mail-ej1-x634.google.com [IPv6:2a00:1450:4864:20::634]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4PtSZ94rtTz4XZG for ; Fri, 7 Apr 2023 19:08:17 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-ej1-x634.google.com with SMTP id sg7so10335209ejc.9 for ; Fri, 07 Apr 2023 12:08:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20210112.gappssmtp.com; s=20210112; t=1680894495; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=ZTFxS3YATsBMNGBhddwMtviBdXD8vEuDlOTFlhRyG8g=; b=L3A5ubc7gEHI2GRR4/eOTlGEB2Q9+OwVqBvAMXQ84R3vuNlfHseT5AFFSpNylwgX6s NjC0ZSn3S2RVcMpbeF0HL1pFIWp3gt9MZKJRal8Sskuu9Zmhk/76YpbY0fgDPO1mR7mU WJ6XHNNnuz5o5sn45GARFXT22L0sSp586I0CzjuS70MrQOG/0OuHQmrIUiUMtWzJNN4r DeCTYvzu43Qk4Q5Vua65v78R80Zdek2CsajhhaSwH0VohCDSWatZcQdkp3KH3WCqSH8/ 7bN3ebSqTpubf8Qh6/m5Jhbiz98ZqWkIHTShmWdADjer3+ROO4GXpyphh+y5YDGOXsjf 6Aig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680894495; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=ZTFxS3YATsBMNGBhddwMtviBdXD8vEuDlOTFlhRyG8g=; b=pTNUiA1lXyNOoddtWc4oXrNYSWZUF3xXbFZblIJJFEdGehc6HFKNCjvX5RzqjGxef7 MNVEGwa3lKo8iQhMwVOp34eNJAt7VrhpySZr/RFImW2q2uyA4JZb/Gl1wmyPXIgdxO5m IhQylqetx9xay9QbvVU57Kdh7DGa1aiarFQzccpup25oSmYaJilohtivSjAF99wEQxDm I3W1hn8LjIBLWOcTXB5TXf0WyLZC6996Zb2IN6QEHfc2FFcP8jaumqZqQ3vTiYwQ921d p0DoIaWG7F6P0maXQR+S/ySusc27K1feY8e5/EJAOFxNvKexkVOsUvncJtCUFh559ji/ iB7Q== X-Gm-Message-State: AAQBX9cTnPP82ZYQH0wkDTkE1stdrUeFz8dxq0kEej17YvK5R4EOZHiI 0VC4U/i6DRV2LbOlbySPkQmLZusFG7uK9C3xBBAuGVlySI4BrPlg X-Google-Smtp-Source: AKy350aefBzbvCfRz7c8pbg0iXKOzt/cbXf3mhg9B7LG2HZmHfJOUtJEu1mFoWo9l1G16sJUd+93e2DP3hAPpeGoGeQ= X-Received: by 2002:a17:907:a707:b0:932:da0d:9375 with SMTP id vw7-20020a170907a70700b00932da0d9375mr182660ejc.4.1680894495216; Fri, 07 Apr 2023 12:08:15 -0700 (PDT) List-Id: Discussions about the use of FreeBSD-current List-Archive: https://lists.freebsd.org/archives/freebsd-current List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-current@freebsd.org MIME-Version: 1.0 References: <202304070922.3379MVW5077791@critter.freebsd.dk> <202304071220.337CK7XH083443@critter.freebsd.dk> In-Reply-To: <202304071220.337CK7XH083443@critter.freebsd.dk> From: Warner Losh Date: Fri, 7 Apr 2023 13:08:04 -0600 Message-ID: Subject: Re: textdumps are too slow To: Poul-Henning Kamp Cc: Alan Somers , FreeBSD CURRENT Content-Type: multipart/alternative; boundary="0000000000004af33c05f8c3bf5f" X-Rspamd-Queue-Id: 4PtSZ94rtTz4XZG X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N --0000000000004af33c05f8c3bf5f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, Apr 7, 2023 at 6:20=E2=80=AFAM Poul-Henning Kamp wrote: > -------- > Alan Somers writes: > > On Fri, Apr 7, 2023 at 2:22=3DE2=3D80=3DAFAM Poul-Henning Kamp < > phk@phk.freebsd.dk> wrote: > > > > I would expect them to be limited by the serial console speed before > > > the video system speed ? > > > > That was my first guess, too. But my serial console is 115200 baud, > > which is faster than the low performance server grade video card. > > Ok, that must truly be sucky hardware... > That's 10x slower than 1990s era VGA cards then... 115200 is 11k characters a second, and FreeBSD on 1990s era VGA cards was in excess of 1MB/s, faster if not a pure ISA card... Video hardware that's slower than *THAT* likely indicates a big big problem in our video stack. Warner --0000000000004af33c05f8c3bf5f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Fri, Apr 7, 2023 at 6:20=E2=80=AFA= M Poul-Henning Kamp <phk@phk.freeb= sd.dk> wrote:
--------
Alan Somers writes:
> On Fri, Apr 7, 2023 at 2:22=3DE2=3D80=3DAFAM Poul-Henning Kamp <phk@phk.freebsd.dk= > wrote:

> > I would expect them to be limited by the serial console speed bef= ore
> > the video system speed ?
>
> That was my first guess, too.=C2=A0 But my serial console is 115200 ba= ud,
> which is faster than the low performance server grade video card.

Ok, that must truly be sucky hardware...

That's 10x slower than 1990s era VGA cards then... 115200 is 11k char= acters a second,
and FreeBSD on 1990s era VGA cards was in excess= of 1MB/s, faster if not a pure ISA
card... Video hardware that&#= 39;s slower than *THAT* likely indicates a big big problem in
our= video stack.

Warner
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