Subject: Re: port-i386/10141: fxp bug(?) on large PCs
To: None <dokas@cs.umn.edu>
From: John Hawkinson <jhawk@MIT.EDU>
List: netbsd-bugs
Date: 05/17/2000 16:23:29
| >Description:
| I've got a Dell PowerEdge 2400 with a built in fxp ethernet adapter.
| Starting with yesterday's -current (May 16), I've started getting lots
| of the following messages:
|
| fxp0: dmasync timeout
|
| at a rate of about 1 per 15 seconds.
Interesting.
I added checks to the fxp driver (dev/ic/i82557.c) to avoid some places
where it had the potential to hang forever:
----------------------------
revision 1.26
date: 2000/05/12 03:35:57; author: jhawk; state: Exp; lines: +26 -7
Catch some potentially infinite loops in while() loops if the chip happens
to "go insane" and never complete some operations (dmasync, etc.).
----------------------------
It appears that in some cases those timeouts may be too short.
It would be good to know which of the timeouts is causing the problem,
and what a better value for it might be. Perhaps the attached patch,
for instance.
Could you also try frobbing the timeout count before the loop,
for instance:
1373 i = 10000;
1374 do {
1375 FXP_CDCONFIGSYNC(sc,
1376 BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
1377 } while ((cbp->cb_status & FXP_CB_STATUS_C) == 0 && --i);
1378 if (i == 0) {
1379 printf("%s: dmasync timeout\n", sc->sc_dev.dv_xname);
1380 return ETIMEDOUT;
change the initialization of i to 100,000 and see if that improves things?
Thanks.
--jhawk
*** sys/dev/ic/i82557.c Wed May 17 16:19:13 2000
--- sys/dev/ic/i82557.c Wed May 17 16:16:42 2000
***************
*** 1376,1382 ****
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((cbp->cb_status & FXP_CB_STATUS_C) == 0 && --i);
if (i == 0) {
! printf("%s: dmasync timeout\n", sc->sc_dev.dv_xname);
return ETIMEDOUT;
}
--- 1376,1382 ----
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((cbp->cb_status & FXP_CB_STATUS_C) == 0 && --i);
if (i == 0) {
! printf("%s: 1dmasync timeout\n", sc->sc_dev.dv_xname);
return ETIMEDOUT;
}
***************
*** 1406,1412 ****
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((cb_ias->cb_status & FXP_CB_STATUS_C) == 0 && --i);
if (i == 0) {
! printf("%s: dmasync timeout\n", sc->sc_dev.dv_xname);
return ETIMEDOUT;
}
/*
--- 1406,1412 ----
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((cb_ias->cb_status & FXP_CB_STATUS_C) == 0 && --i);
if (i == 0) {
! printf("%s: 2dmasync timeout\n", sc->sc_dev.dv_xname);
return ETIMEDOUT;
}
/*
***************
*** 1865,1871 ****
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((mcsp->cb_status & FXP_CB_STATUS_C) == 0 && --count);
if (count == 0) {
! printf("%s: dmasync timeout\n", sc->sc_dev.dv_xname);
return;
}
}
--- 1865,1871 ----
BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
} while ((mcsp->cb_status & FXP_CB_STATUS_C) == 0 && --count);
if (count == 0) {
! printf("%s: 3dmasync timeout\n", sc->sc_dev.dv_xname);
return;
}
}