Date: Wed, 4 Jun 1997 00:43:54 -0700 (MST) From: Richard Straka <straka@inficad.com> To: current@freebsd.org Subject: Re: sio driver performance Message-ID: <Pine.BSI.3.95.970604004053.15875A-100000@user2.inficad.com> In-Reply-To: <Pine.BSI.3.95.970604001520.15234B-100000@user2.inficad.com>
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On Wed, 4 Jun 1997, Richard Straka wrote: > I have 2 16550A UARTS in a 486DX-33. During probing, the sio > driver properly identifies both ports as 16550A's. > > When sending sustained 115200 baud data from this machine, systat > (with vmstat option) indicates an interrupt rate of about 720/sec > with about 2% of the processor servicing interrupts. > When receiving sustained 115200 baud data, an interrupt rate of > over 26,000/sec is indicated with about 15% of the processor going > to service interrupts. > > It appears as though the fifo is not working for the receive. In an > attempt to exhonerate the hardware, I swapped in another 16550 card > I had laying around and got the similar results. > > Any help on this issue would be greatly appreciated. > I neglected to mention that I am running 2.2.1-RELEASE on the 486DX-33. Richard Straka straka@inficad.com
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