Re: [PATCH] zerocopy NFS updated

Trond Myklebust
2002-04-18T08:53:58Z

>>>>> " " == Hirokazu Takahashi <taka@valinux.co.jp> writes:

> Hi, I've been thinking about your comment, and I realized it
> was a good suggestion. There are no problem with the zerocopy
> NFS, but If you want to use UDP sendfile for streaming or
> something like that, you wouldn't get good performance.

Surely one can work around this in userland without inventing a load
of ad-hoc schemes in the kernel socket layer?

If one doesn't want to create a pool of sockets in order to service
the different threads, one can use generic methods such as
sys_readahead() in order to ensure that the relevant data gets paged
in prior to hogging the socket.

There is no difference between UDP and TCP sendfile() in this respect.

Cheers,
Trond