On Mon, 9 Dec 2019 at 18:42, Björn Töpel <bjorn.topel@xxxxxxxxx> wrote: > [...] > > You mentioned in the earlier version that this would impact the time it > > takes to attach an XDP program. Got any numbers for this? > > > > Ah, no, I forgot to measure that. I'll get back with that. So, when a > new program is entered or removed from dispatcher, it needs to be > re-jited, but more importantly -- a text poke is needed. I don't know > if this is a concern or not, but let's measure it. > Toke, I tried to measure the impact, but didn't really get anything useful out. :-( My concern was mainly that text-poking is a point of contention, and it messes with the icache. As for contention, we're already synchronized around the rtnl-lock. As for the icache-flush effects... well... I'm open to suggestions how to measure the impact in a useful way. > > Björn > > > -Toke > >
