Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Tue, 3 Sep 2002 16:41:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Tue, 3 Sep 2002 16:41:29 -0400 Received: from pc1-cwma1-5-cust128.swa.cable.ntl.com ([80.5.120.128]:23023 "EHLO irongate.swansea.linux.org.uk") by vger.kernel.org with ESMTP id ; Tue, 3 Sep 2002 16:41:28 -0400 Subject: Re: lockup on Athlon systems, kernel race condition? From: Alan Cox To: Andrew Morton Cc: Terence Ripperda , linux-kernel@vger.kernel.org In-Reply-To: <3D750548.9D130AB3@zip.com.au> References: <20020830204022.GC736@hygelac> <3D6FE062.A48B6F03@zip.com.au> <20020903183524.GC2343@hygelac> <3D750548.9D130AB3@zip.com.au> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 (1.0.8-6) Date: 03 Sep 2002 21:46:53 +0100 Message-Id: <1031086013.21409.20.camel@irongate.swansea.linux.org.uk> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 849 Lines: 16 On Tue, 2002-09-03 at 19:54, Andrew Morton wrote: > Some systems will drop nasty messages in the logs when APIC checksum > errors are detected. And such systems will also be prone to lockups > due to failed delivery. But whether IPIs can be lost without any such > warning signs: don't know, sorry. Our IPI code requires the other end ack, so its pretty much impossible for it to occur at the software end. The hardware in theory can also not lose messages both because of queueing and checksums. On pentiums there are documented errata with 3 interrupts matched to the same priority but not on Athlon - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/