Re: [PATCH][RFC 23/23]: Support for zero-copy TCP transmit of user space data

Evgeniy Polyakov
2008-12-24T18:08:57Z

On Wed, Dec 24, 2008 at 08:46:56PM +0300, Vladislav Bolkhovitin (vst@vlnb.net) wrote:
> I think in most cases there would be possibility to embed
> sk_transaction_token to some higher level structure. E.g. Xen apparently
> should have something to track packets passed through host/guest
> boundary. From other side, kmem cache is too well polished to have much
> overhead. I doubt, you would even notice it in this application. In most
> cases allocation of such small object in it using SLUB is just about the
> same as a list_del() under disabled IRQs.

I definitely would not rely on that, especially at cache reclaim time.
But it of course depends on the workload and maybe appropriate for the
cases in question. The best solution I think is to combine tag and
separate destructur, so that those who do not want to allocate a token
could still get notification via destructor callback.

--
Evgeniy Polyakov