Date: Tue, 02 Nov 2004 15:33:47 -0800 From: Maksim Yevmenkin <maksim.yevmenkin@savvis.net> To: Niki Denev <nike_d@cytexbg.com> Cc: current@freebsd.org Subject: Re: bluetooth / hcseriald panics -current. Message-ID: <4188195B.5060502@savvis.net> In-Reply-To: <cone.1099438977.206550.865.1001@phobos.totalterror.net> References: <cone.1097691798.355655.4951.1001@niked.office.suresupport.com> <cone.1097705266.944205.768.1001@phobos.totalterror.net> <416DB569.4010805@savvis.net> <cone.1097710541.778981.578.1001@phobos.totalterror.net> <416DC1E5.1060904@savvis.net> <cone.1097714033.77176.578.1001@phobos.totalterror.net> <4187E594.5080306@savvis.net> <cone.1099438977.206550.865.1001@phobos.totalterror.net>
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Niki, > i have applied the patch and now the panic is gone, but my console gets > filled with stuff like that : > > WARNING: Network stack Giant-free, but ng_h4 requires Giant. > ng_h4_input: sio4 - line error 0x1000000, c=0xc0 > ng_h4_input: sio4 - line error 0x1000000, c=0x1 > ng_h4_input: sio4 - line error 0x1000000, c=0xa > ng_h4_input: sio4 - line error 0x1000000, c=0x9 > ng_h4_input: sio4 - ignoring unknown packet type=0x90 > ng_h4_input: sio4 - ignoring unknown packet type=0xa5 > ng_h4_input: sio4 - ignoring unknown packet type=0x8f > ng_h4_input: sio4 - ignoring unknown packet type=0xaf > ng_h4_input: sio4 - ignoring unknown packet type=0x57 > ng_h4_input: sio4 - line error 0x1000000, c=0x17 > ng_h4_input: sio4 - ignoring unknown packet type=0xd8 > ng_h4_input: sio4 - line error 0x1000000, c=0xc0 > ng_h4_input: sio4 - line error 0x1000000, c=0x1 > ng_h4_input: sio4 - line error 0x1000000, c=0xa > ng_h4_input: sio4 - line error 0x1000000, c=0x9 > ng_h4_input: sio4 - ignoring unknown packet type=0x90 > ng_h4_input: sio4 - ignoring unknown packet type=0xa5 > ng_h4_input: sio4 - ignoring unknown packet type=0x8f > ng_h4_input: sio4 - ignoring unknown packet type=0xaf > ng_h4_input: sio4 - ignoring unknown packet type=0x57 > ng_h4_input: sio4 - line error 0x1000000, c=0x17 > ng_h4_input: sio4 - ignoring unknown packet type=0xd8 > ng_h4_input: sio4 - line error 0x1000000, c=0xc0 that is what happens when fifo is not drained completely in time :( you should also see messages about "silo overflow" as well. as i explained before this is an interrupt latency problem. bluetooth links normally operate at up to 400 kb/s speed (symmetric asynchronous channel). and yet some (most?) manufacturers put 16550 uarts with 16 bytes fifo on those cards. to make things worse no flow control is implemented :( h4 was not designed for links that drop bytes. bluetooth spec requires to reset device every time there is a synchronization loss is detected. ng_h4(4) does not reset the device (too extreme) instead it just tries to re-synchronize. so the things you can try: 1) get a much faster cpu :) 2) disable WITNESSxxx and INVARIANTSxxx; 3) try to convince your system to allocate separate irq to the bluetooth card; 4) try to convince sio(4) driver to activate interrupts in FAST mode. max
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