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Message-Id: <20080711.033242.58168774.davem@davemloft.net> Date: Fri, 11 Jul 2008 03:32:42 -0700 (PDT) From: David Miller <davem@...emloft.net> To: matthew@....cx Cc: ebiederm@...ssion.com, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, grundler@...isc-linux.org, mingo@...e.hu, tglx@...utronix.de, jgarzik@...ox.com, linux-ide@...r.kernel.org, suresh.b.siddha@...el.com, benh@...nel.crashing.org, jbarnes@...tuousgeek.org, rdunlap@...otime.net, mtk.manpages@...il.com Subject: Re: Multiple MSI, take 3 From: Matthew Wilcox <matthew@....cx> Date: Fri, 11 Jul 2008 04:23:26 -0600 > On Fri, Jul 11, 2008 at 03:06:33AM -0700, Eric W. Biederman wrote: > > So unless the performance of the AHCI is better by a huge amount I don't > > see the point, and even then I am extremely sceptical. > > I don't have performance numbers yet, but surely you can see that > avoiding a register read in the interrupt path is a large win? Such overhead is going to be amortized. AHCI is not like networking where we have lots of very small transactions to deal with, and therefore the per-IRQ overhead can begin to dominate. Therefore, like Eric, I think workng on multiple MSI is a very dubious usage of one's time. But, it's your time, so use it how you wish :) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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