From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [patch 2/2] QEMU: decrease console "refresh rate" with -nographic Date: Tue, 15 Apr 2008 09:20:35 -0500 Message-ID: <4804B9B3.3040904@codemonkey.ws> References: <20080411183852.150819622@localhost.localdomain> <20080411184851.559593822@localhost.localdomain> <4802352A.4010105@flac.kalibalik.dk> <20080414150255.GA11640@dmt> <48038526.3090702@qumranet.com> <20080414172446.GA27224@dmt> <35388.bFoQE3daRhY=.1208244417.squirrel@webmail.hotelhot.dk> <48047519.9080007@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net, Marcelo Tosatti To: Avi Kivity Return-path: In-Reply-To: <48047519.9080007@qumranet.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org Avi Kivity wrote: > Anders wrote: > >>>> Why not enable SIGIO on stdio input, like the rest of the fd handling in >>>> qemu? >>>> >>>> >>> Thats a possibility, but I think we've now agreed that doing select() with >>> a timeout is cleaner and possibly half a cent faster. >>> >>> >> Since I can only follow this list as a hobby, I managed to miss that >> discussion. Can somebody point me to the relevant thread, as I would find >> it interesting? >> >> >> > > This was off-list. The point is, that with the iothread we don't need > to rely on signals at all (qemu needs signals to break out of the > emulation loop, kvm without iothread needs them to exit guest mode, but > the iothread can simply sit in select() waiting for an fd to become > active (or for aio to complete via a signal). > Why did we ever need sigtimedwait() anyway? Even if we were select()ing within the VCPU context, we should break out of the select() on signal delivery. Regards, Anthony Liguori ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone