On Sun, May 02, 2021 at 04:08:18PM +0300, Andrey V. Elsukov wrote: > 30.04.2021 23:32, Mark Johnston пишет: > > Second, netipsec unconditionally hands rx processing off to netisr > > threads for some reason, that's why changing the dispatch policy doesn't > > help. Maybe it's to help avoid running out of kernel stack space or to > > somehow avoid packet reordering in some case that is not clear to me. I > > tried a patch (see below) which eliminates this and it helped somewhat. > > If anyone can provide an explanation for the current behaviour I'd > > appreciate it. > > Previously we have reports about kernel stack overflow during IPsec > processing. In your example there is only one IPsec transform is > configured, but it is possible to configure several in the bundle, > AFAIR, it is limited to 4 transforms. E.g. if you configure ESP+AH - it > is bundle of two transforms and this will grow kernel stack requirements.
Is it only a problem for synchronous crypto ops? With hardware drivers I'd expect the stack usage to be reset after each transform, since completions are handled by a dedicated thread. There is also the net.inet.ipsec.async_crypto knob, which has a similar effect I think. _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
