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Date: Tue, 20 Mar 2007 11:54:25 -0800 From: Zachary Amsden <zach@...are.com> To: Andi Kleen <ak@....de> CC: Linus Torvalds <torvalds@...ux-foundation.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, Jeremy Fitzhardinge <jeremy@...p.org>, Rusty Russell <rusty@...tcorp.com.au>, David Miller <davem@...emloft.net>, mingo@...e.hu, akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com, chrisw@...s-sol.org, anthony@...emonkey.ws, netdev@...r.kernel.org Subject: Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable Andi Kleen wrote: > One thing I was pondering was to replace the expensive popfs with > > bt $IF,(%rsp) > jnc 1f > sti > 1: > > But would be mostly a P4 optimization again and I'm not 100% sure it is > worth it. > Worth it on 32-bit. On AMD64, probably not. On Intel 64-bit, maybe, but less important than in P4 days. This could change character completely if used at the tail of a function where you now have sti; 1: ret Which generates an interrupt holdoff on the ret, an unusual thing to do. Zach - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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