Date: Fri, 7 Apr 2023 12:36:15 -0700 From: Alan Somers <asomers@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: textdumps are too slow Message-ID: <CAOtMX2gbpy4AXXScbEsc5ho3cv7M%2BT8aVuwyak-PeSdzPqOd_g@mail.gmail.com> In-Reply-To: <CANCZdfroaGxPLT_PkhqXqJ07JovCv-TChf5AecxquPG6SKo=eA@mail.gmail.com> 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> <CANCZdfroaGxPLT_PkhqXqJ07JovCv-TChf5AecxquPG6SKo=eA@mail.gmail.com>
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On Fri, Apr 7, 2023 at 12:08=E2=80=AFPM Warner Losh <imp@bsdimp.com> wrote: > > > > On Fri, Apr 7, 2023 at 6:20=E2=80=AFAM Poul-Henning Kamp <phk@phk.freebsd= .dk> wrote: >> >> -------- >> Alan Somers writes: >> > On Fri, Apr 7, 2023 at 2:22=3DE2=3D80=3DAFAM Poul-Henning Kamp <phk@ph= k.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 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).
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