On Tue, Aug 02, 2005 at 12:33:33PM -0400, Pradeep Padala wrote: > >Tux was a nice experiment, until somebody showed that you can get the > >same performance from userspace by using sendfile(). The performance > >argument no longer holds. > > Agreed, but I believe there are still some gray areas. For example, > using multiple streams for transfering a file. Yes, this can be done in > the user mode, probably as effectively, but doing it in the kernel is > still an interesting thing to do. If you mean "interesting" as in "interesting ways to crash your kernel by minor programming errors", I agree. > Another scenario is to perform data > transfers as close to wire speeds as possible. Try vsftpd. It does wire speed transfers from userspace. It's the FTP daemon that powers a couple of the largest FTP sites in the world, like ftp.kernel.org, ftp.redhat.com, etc. To quote Alan Cox: "finally we have a scalable ftpd for Linux". See http://vsftpd.beasts.org/ . > I work in high > performance computing environments, and somethings can be done only by > tweaking the kernel. There is a difference between tweaking and adding new functionality. Erik -- Erik Mouw J.A.K.Mouw@xxxxxxxxxxxxxx mouw@xxxxxxxxxxxx
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