Date: Fri, 7 Apr 2023 13:08:04 -0600 From: Warner Losh <imp@bsdimp.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: Alan Somers <asomers@freebsd.org>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: textdumps are too slow Message-ID: <CANCZdfroaGxPLT_PkhqXqJ07JovCv-TChf5AecxquPG6SKo=eA@mail.gmail.com> In-Reply-To: <202304071220.337CK7XH083443@critter.freebsd.dk> References: <CAOtMX2j-Muz2uFE5YkYQ7atvQO9VrT4pDdvVnay-S%2BNi6rZNMQ@mail.gmail.com> <202304070922.3379MVW5077791@critter.freebsd.dk> <CAOtMX2go2PKC-hDOncJjHxfZRSY3AMGRSGXDF20O%2BzjFoQs=uA@mail.gmail.com> <202304071220.337CK7XH083443@critter.freebsd.dk>
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[-- Attachment #1 --] On Fri, Apr 7, 2023 at 6:20 AM Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > Alan Somers writes: > > On Fri, Apr 7, 2023 at 2:22=E2=80=AFAM 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 [-- Attachment #2 --] <div dir="ltr"><div dir="ltr"><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 7, 2023 at 6:20 AM Poul-Henning Kamp <<a href="mailto:phk@phk.freebsd.dk">phk@phk.freebsd.dk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">--------<br> Alan Somers writes:<br> > On Fri, Apr 7, 2023 at 2:22=E2=80=AFAM Poul-Henning Kamp <<a href="mailto:phk@phk.freebsd.dk" target="_blank">phk@phk.freebsd.dk</a>> wrote:<br> <br> > > I would expect them to be limited by the serial console speed before<br> > > the video system speed ?<br> ><br> > That was my first guess, too. But my serial console is 115200 baud,<br> > which is faster than the low performance server grade video card.<br> <br> Ok, that must truly be sucky hardware...<br></blockquote><div><br></div><div>That's 10x slower than 1990s era VGA cards then... 115200 is 11k characters a second,</div><div>and FreeBSD on 1990s era VGA cards was in excess of 1MB/s, faster if not a pure ISA</div><div>card... Video hardware that's slower than *THAT* likely indicates a big big problem in</div><div>our video stack.</div><div><br></div><div>Warner</div></div></div>help
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