Date: Fri, 22 Nov 2002 19:33:43 -0800 From: "Maksim Yevmenkin" <Maksim.Yevmenkin@cw.com> To: "M. Warner Losh" <imp@bsdimp.com> Cc: <vova@sw.ru>, <shizukakudo_99@yahoo.com>, <freebsd-current@FreeBSD.ORG> Subject: RE: Bluetooth questions Message-ID: <45258A4365C6B24A9832BFE224837D552B1265@sjdcex01.int.exodus.net>
next in thread | raw e-mail | index | archive | help
> In message: = <45258A4365C6B24A9832BFE224837D552B1264@sjdcex01.int.exodus.net> > "Maksim Yevmenkin" <Maksim.Yevmenkin@cw.com> writes: > : I see a lot of "silo overflow" errors under moderate load. > : As a result bytes get dropped on the floor. The Bluetooth > : spec defines extremely simple serial protocol (H4). It simply > : cannot tolerate UARTs that drop bytes. If at least one byte > : gets dropped the entire HCI frame is lost. If HCI frame gets > : dropped then "out of sync" condition exist and all bets are > : off. The only way to get back "in sync" is to send Reset to > : the device. After Reset device goes into standby state and > : all operational state is lost.=20 >=20 > OK. That makes sense. Part of the problem even with even fast > interrupt handlers is that interrupts are masked for way way too much > code in -current, as compared to -stable. What baud rate are you > running at? I'm running at 56k, which isn't the full datarate for > 115200 baud that could be used. Even with a fast interrupt, you'd get > SIO overflows in current, at least according to some reports. everything is set to 115200, but i think the hardware does=20 something funny with the divisor and internal rate is much higher. with OLDCARD i managed to run Xircom card with fast interrupts and acually got about 50 KBytes/sec. USB devices give me about 60KBytes/sec. > Hmmm, maybe I should get one of these cards, or one a normal sio > cards and run them at 115200 baud. good idea. thanks, max To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?45258A4365C6B24A9832BFE224837D552B1265>