Date: Tue, 27 Apr 1999 00:24:55 +0400 From: Dmitrij Tejblum <tejblum@arc.hq.cti.ru> To: Doug Rabson <dfr@nlsystems.com> Cc: Dmitrij Tejblum <dima@tejblum.dnttm.rssi.ru>, freebsd-alpha@freebsd.org Subject: Re: "I-stream memory barrier" Message-ID: <199904262024.AAA38299@arc.hq.cti.ru> In-Reply-To: Your message of "Sun, 25 Apr 1999 19:12:14 BST." <Pine.BSF.4.05.9904251900440.28665-100000@herring.nlsystems.com>
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> I'm pretty sure that I-cache lines are tagged with ASNs. The Linux kernel > only calls imb() when it runs out of ASNs Well, you are right, even comments in the NetBSD pmap say so. Nevertheles, they call alpha_pal_imb() a lot - there should be a reason for that. Also, take a look at Linux' ev5_flush_tlb_current_page() - it flush whole ASN when it have to flush something executable, rather than do a TBIS. > and if it didn't work properly, > I doubt that a system could survive even a single threaded make world, let > alone -j20. This is not very convincing :-). I have seen as single threaded make world fail mysteriously. (That is exactly why I started to look at the issue :-). Dima To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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