Date: Wed, 4 Apr 2001 04:10:03 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.org Subject: Re: i386/26261: silo overflow problem in sio driver Message-ID: <200104041110.f34BA3R75890@freefall.freebsd.org>
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The following reply was made to PR i386/26261; it has been noted by GNATS. From: Bruce Evans <bde@zeta.org.au> To: Rich Wales <richw@webcom.com> Cc: freebsd-gnats-submit@FreeBSD.ORG Subject: Re: i386/26261: silo overflow problem in sio driver Date: Wed, 4 Apr 2001 21:02:24 +1000 (EST) On Tue, 3 Apr 2001, Rich Wales wrote: > WATANABE Kiyoshi wrote: > > > try this patch. > > + cp4ticks *= 10; /* to avoid buffer overflow */ > > Thanks. This helped to some extent, though I'm still seeing some > silo overflows even with the above patch. Should the "10" be bumped > up to something larger, perhaps? This can't possibly help reduce silo overflows, since it increases the size a driver buffer, but silo overflows occur when a hardware buffer is too small. Silo overflows are caused by non-sio hardware hogging the bus or by interrupt latency outside the driver. They should never occur at low speeds like 115200 bps even on 386/20's (except in -current, where interrupt latency outside the driver is certainly broken enough to matter even on 486DX2/66's). Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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