From nobody Fri Apr 7 19:36:15 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 4PtTBh2NMkz444bG for ; Fri, 7 Apr 2023 19:36:28 +0000 (UTC) (envelope-from asomers@gmail.com) Received: from mail-vs1-f43.google.com (mail-vs1-f43.google.com [209.85.217.43]) (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 4PtTBg6cCjz4CMZ for ; Fri, 7 Apr 2023 19:36:27 +0000 (UTC) (envelope-from asomers@gmail.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-vs1-f43.google.com with SMTP id cz11so37652855vsb.6 for ; Fri, 07 Apr 2023 12:36:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680896187; x=1683488187; h=content-transfer-encoding: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=78By2mC9lHVUP+MzWb8L++nA8cVoIkUaamy1Lne2wwM=; b=gECVhPq6wtWb0iwqgiEW8IL4jCtjR/jl43QxcEjGE9WiMPYls5S3JXMDZizZJrk+yj Ldhcho+OM41w4k3ouW10wNJYlEEXqzRu5SQLhJoF834ALXKTQ2730q7sDw0QNZ59/VtG dHPMeLqDJh+k/LyuXOSUdKtqJynPMgBtU0OR0PZNIvxSJmgOBBw+HA0f6WzQpZfm01+6 DVJKKBqYWXFsce1yoISYTWKvfVPmGl8fq6P6XvsHao1elmTthSMzAOcYNWfs3rUl4qJ0 3Wtqozli7WKqQs6mte9LsgIIvkENLP2++2rgaj4qVQkhlW8l3WLWu1a74p14bO2IJGj6 IscA== X-Gm-Message-State: AAQBX9djDkJoI/Q75mo7GvCvHGminx3q3AnvTE1pupYp+ClErEaXQDK6 x6xdZ0WJWplNOsm8zEKtbqH+eeP9eQbo1yRCjCh8py4v X-Google-Smtp-Source: AKy350b2IlfNh8QL0THcz9sI1B0MLwIHhiWuVE9AHY4ygTT5/fTfFx/C5wkUsCK2txOeS9G15UFS6FgLZoBUuePkIR0= X-Received: by 2002:a67:d481:0:b0:42c:35a3:2155 with SMTP id g1-20020a67d481000000b0042c35a32155mr51851vsj.4.1680896187027; Fri, 07 Apr 2023 12:36:27 -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: From: Alan Somers Date: Fri, 7 Apr 2023 12:36:15 -0700 Message-ID: Subject: Re: textdumps are too slow To: Warner Losh Cc: Poul-Henning Kamp , FreeBSD CURRENT Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 4PtTBg6cCjz4CMZ X-Spamd-Bar: ---- X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US] X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-ThisMailContainsUnwantedMimeParts: N On Fri, Apr 7, 2023 at 12:08=E2=80=AFPM Warner Losh wrote: > > > > 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 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 characte= rs 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 b= ig problem in > our video stack. > > Warner While I'm logged into the video terminal in a normal login session, I measure about 28M characters/second. So maybe the slow speed is due to something inefficient in ddb(4).