From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: [Qemu-devel] [PATCH 1/5] PCI DMA API (v3) Date: Sat, 19 Apr 2008 15:02:34 -0500 Message-ID: <480A4FDA.3070706@codemonkey.ws> References: <1208297491-1287-1-git-send-email-aliguori@us.ibm.com> <4806596C.4090107@us.ibm.com> <4807ADA7.7000500@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel@lists.sourceforge.net, qemu-devel@nongnu.org, Marcelo Tosatti , Paul Brook , Aurelien Jarno To: Blue Swirl Return-path: In-Reply-To: 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 Blue Swirl wrote: > On 4/17/08, Anthony Liguori wrote: > >> Yes, the vector version of packet receive is tough. I'll take a look at >> your patch. Basically, you need to associate a set of RX vectors with each >> VLANClientState and then when it comes time to deliver a packet to the VLAN, >> before calling fd_read, see if there is an RX vector available for the >> client. >> >> In the case of tap, I want to optimize further and do the initial readv() >> to one of the clients RX buffers and then copy that RX buffer to the rest of >> the clients if necessary. >> > > The vector versions should also help SLIRP to add IP and Ethernet > headers to the incoming packets. > Yeah, I'm hoping that with my posted linux-aio interface, I can add vector support since linux-aio has a proper asynchronous vector function. Are we happy with the DMA API? If so, we should commit it now so we can start adding proper vector interfaces for net/block. Regards, Anthony Liguori > I made an initial version of the vectored AIO SCSI with ESP. It does > not work, but I can see that just using the vectors won't give too > much extra performance, because at least initially the vector length > is 1. Collecting the statuses may be tricky. > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > 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 > ------------------------------------------------------------------------ > > _______________________________________________ > kvm-devel mailing list > kvm-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/kvm-devel > ------------------------------------------------------------------------- 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