Date: Thu, 23 Dec 1999 23:25:50 -0800 From: Mike Smith <msmith@freebsd.org> To: Joe McGuckin <joe@via.net> Cc: hackers@freebsd.org Subject: Re: motherboard serial port dropping chars ? Message-ID: <199912240725.XAA02292@mass.cdrom.com> In-Reply-To: Your message of "Mon, 20 Dec 1999 20:23:11 PST." <199912210423.UAA76829@monk.via.net>
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> > I have an application where I need to receive data constantly on > a serial port at 38,400. When we write the data to a database, > we constantly see dropped chars on the incoming serial port. > > Is the stock PC serial hardware capable of sustained thruput at > 38.4K? Easily, modulo other peripherals which can interfere with this. > Is there an ioctl option or something to improve the buffering > on the serial ports ? No. You probably have a PCI peripheral that's hogging the bus for sufficiently long to cause the FIFO in your serial device to overflow. IDE disks doing DMA are prime culprits for this, and X servers have been known to cause it as well (by disabling interrupts entirely). -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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