Date: Sat, 20 Jan 2007 06:53:21 +0000 (GMT) From: wpaul@FreeBSD.ORG (Bill Paul) To: jfvogel@gmail.com (Jack Vogel) Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org, jon.otterholm@ide.resurscentrum.se Subject: Re: Lenovo X60 em workaround Message-ID: <20070120065321.DB61216A405@hub.freebsd.org> In-Reply-To: <2a41acea0701171258k16b4c6ebuf1d4794b89d0749b@mail.gmail.com> from Jack Vogel at "Jan 17, 2007 12:58:04 pm"
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> Since this was just seen, and the patch below validated as working I wanted > to send general email to capture this: > > The Lenovo X60 can have issues with long ping times, this is a KNOWN > hardware problem, and Intel is working with IBM/Lenovo, a final 'fix' has > not been decided on yet. Nevertheless, the patch below will work, but > I do not want to check it in as its still temporary. > > Address questions to me, Okay, I have a question. Could you elaborate on just what the problem is? (I mean, since it's KNOWN and all...) I'm just having a hard time figuring out what problem could possibly be fixed by setting the RX interrupt delay timer to a non-zero value (especially since elsewhere in the em(4) source it says that doing so is a Bad Thing (tm)). -Bill > Jack > > PS This is based on 6.2, but is needed for CURRENT as well. > > > --- if_em.dist.c Wed Jan 17 17:59:46 2007 > +++ if_em.c Wed Jan 17 18:03:13 2007 > @@ -3348,6 +3348,10 @@ > E1000_WRITE_REG(&adapter->hw, RXCSUM, reg_rxcsum); > } > > + /* TEMPORARY WORKAROUND for X60 */ > + if (adapter->hw.mac_type == em_82573) > + E1000_WRITE_REG(&adapter->hw, RDTR, 32); > + > /* Enable Receives */ > E1000_WRITE_REG(&adapter->hw, RCTL, reg_rctl); > /* >
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