On Fri, 2015-01-23 at 13:36 +0200, Emmanuel Grumbach wrote: > > It's not actually just "one packet for each vif/ac" - it's a whole tail > > of whatever other RCU usages there are. Back when this was discussed, > > the wizery people measured this to hundreds of ms in many not too > > uncommon cases. > > That's the part I didn't know. I wasn't aware that this > synchronize_net() was there and that someone removed it. This particular one might not have been there - I don't remember. There were some in this path and we removed quite a few. However, if you have keys, wpa_s is currently clearing them, which calls it for every single key. I once had worked on an optimisation here (telling wpa_s not to clear keys because we handle that when stations are deleted anyway) but so far that didn't really go anywhere. > I just wonder how we handle the case where we still have packets in > the Tx path and we bring everything down. I can check the code, but > not right now. Well - I didn't expect you to check anything now :-) I was more noting this down for 'future work'. It's possible, perhaps, that we cannot do anything else here, but then we should think about the other optimisations again... johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
