On Thu, Nov 16 2006, David Miller wrote:
> From: "Jim Schutt" <[email protected]>
> Date: Thu, 16 Nov 2006 11:08:59 -0700
>
> > Or is read+write really the fastest way to get data off a
> > socket and into a file?
>
> There is still no explicit TCP support for splice/vmsplice so things
> get copied around and most of the other advantaves of splice/vmplice
> aren't obtained either. So perhaps that explains your numbers.
There should not be any copying for tcp send, at least no more than what
sendfile() did/does. Hmm?
> Jens Axboe tries to get things working, and others have looked into it
> too, but adding TCP support is hard and for several reasons folks like
> Alexey Kuznetsov and Evgeniy Polyakov believe that sys_receivefile()
> is an interface much better suited for TCP receive.
>
> splice/vmsplice has a lot of state connected to a transaction, and
> perhaps that is part of why Evgeniy and Alexey have trouble wrapping
> their brains around an efficient implementation.
I hope to try and see if I can help get some of that done, however I
need all the help I can get on the networking side. Not sure I
understand why it has to be so difficult, if we need to define a wrapper
container instead of passing down a pipe that is completely fine with
me. The networking code basically just needs to hang on to the
pipe_buffer and release it on ack for send, receive is somewhat more
involved (and I don't know enough about networking to voice any
half-intelligent opinion on that!).
I would just consider it a damn shame if we cannot complete the splice
family and need to punt to something else for net receive.
--
Jens Axboe
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
