Date: Wed, 15 Nov 2006 20:29:11 -0800 (PST) From: mjacob@freebsd.org To: Scott Long <scottl@samsco.org> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: cvs commit: src/sys/dev/mpt mpt_pci.c Message-ID: <20061115202136.K7698@ns1.feral.com> In-Reply-To: <455BE6DF.4090907@samsco.org> References: <200611152018.kAFKI9A3061678@repoman.freebsd.org> <200611151617.23125.jhb@freebsd.org> <20061115134949.T1700@ns1.feral.com> <20061115192354.D7197@ns1.feral.com> <455BDC68.2080603@samsco.org> <20061115194305.M7355@ns1.feral.com> <455BDFB7.9040303@samsco.org> <20061115200109.U7495@ns1.feral.com> <455BE6DF.4090907@samsco.org>
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On Wed, 15 Nov 2006, Scott Long wrote: > mjacob@freebsd.org wrote: >> >> see http://people.freebsd.org/~mjacob for 2 bootverbose files. >> >> > > Ah, it looks like the MPT chips support 8 messages. I think that > John's patch assumes only 1 message for it. No, John's patch will only enable MSI for a count of one. The PCI cards I have that support MSI are: AMD: QLogic 6312 (MSI 8) LSI-Logic 1030 (MSI 1) LSI-Logic 1030 (MSI 1) [ STUPID ME- The FC929 doesn't have MSI ] Broadcom NetXtreme (MSI 8) Broadcom NetXtreme (MSI 8) SuperMicro LSI-Logic 4Gb (MSI-1 MSI-X 1) LSI-Logic 4Gb (MSI-1 MSI-X 1) LSI-Logic SAS (MSI-1 MSI-X 1) QLogic 2422 4Gb (MSI 8) QLogic 2422 4Gb (MSI 8) em (MSI 1) I would guess you were looking at the one of the other devs. > For some devices, > requesting 1 message when N are available will work, but it really is > undefined behaviour and is dependent on the device to DTRT. So in your > case, some of the MPT chips handled it well, some did not. Just out of > curiosity, do you have any MPT docs that describe its MSI capabilities? > In any case, it should probably be disabled in the MPT driver until we > have a better understanding of how it works there. > > For your if_em problem, I'm not seeing what the problem is. It looks > like em0 was successful at getting an IP address over DHCP, so I would > assume that interrupts are working on it. Nope. That's why I included the change to disable msi in the boot verbose (there are two boot sessions there). You can have a *mostly* functional ethernet w/o interrupts functioning- you just get watchdog resets.
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