Messages in this thread | | | Date | Fri, 14 Nov 2008 10:06:57 +0100 | From | "Olaf van der Spek" <> | Subject | Re: Unix sockets via TCP on localhost: is TCP slower? |
| |
On Fri, Nov 14, 2008 at 9:54 AM, Eric Dumazet <dada1@cosmosbay.com> wrote: >> I expected the kernel to copy data directly from user-space of the >> sending process to a kernel buffer of the receiving process, much like >> UNIX sockets. >> > > localhost uses a standard network device, and whole network stack > is used, no 'special kludges'. You can add iptables rules, you > can do trafic shaping, trafic sniffing (tcpdump), limiting > memory used by all sockets (controlling memory pressure on the > machine) > > Doing what you suggest would slow down AF_INET stack.
Why?
> You probably can expect AF_UNIX to be faster, since this one is really > special and use shortcuts. > > Then, you probably can use shared memory instead of AF_UNIX, or > pipes (and splice()), or ... > > Then you probably can use threads and do zero-copy ;)
Hmm, I'd like to avoid running my web server inside of my database server process. ;)
| |