Fri, May 10, 2024 at 12:52:52PM CEST, mst@xxxxxxxxxx wrote: >On Fri, May 10, 2024 at 12:37:15PM +0200, Jiri Pirko wrote: >> Thu, May 09, 2024 at 04:28:12PM CEST, mst@xxxxxxxxxx wrote: >> >On Thu, May 09, 2024 at 03:31:56PM +0200, Jiri Pirko wrote: >> >> Thu, May 09, 2024 at 02:41:39PM CEST, mst@xxxxxxxxxx wrote: >> >> >On Thu, May 09, 2024 at 01:46:15PM +0200, Jiri Pirko wrote: >> >> >> From: Jiri Pirko <jiri@xxxxxxxxxx> >> >> >> >> >> >> Add support for Byte Queue Limits (BQL). >> >> >> >> >> >> Signed-off-by: Jiri Pirko <jiri@xxxxxxxxxx> >> >> > >> >> >Can we get more detail on the benefits you observe etc? >> >> >Thanks! >> >> >> >> More info about the BQL in general is here: >> >> https://lwn.net/Articles/469652/ >> > >> >I know about BQL in general. We discussed BQL for virtio in the past >> >mostly I got the feedback from net core maintainers that it likely won't >> >benefit virtio. >> >> Do you have some link to that, or is it this thread: >> https://lore.kernel.org/netdev/21384cb5-99a6-7431-1039-b356521e1bc3@xxxxxxxxxx/ > > >A quick search on lore turned up this, for example: >https://lore.kernel.org/all/a11eee78-b2a1-3dbc-4821-b5f4bfaae819@xxxxxxxxx/ Says: "Note that NIC with many TX queues make BQL almost useless, only adding extra overhead." But virtio can have one tx queue, I guess that could be quite common configuration in lot of deployments. > > > > >> I don't see why virtio should be any different from other >> drivers/devices that benefit from bql. HOL blocking is the same here are >> everywhere. >> >> > >> >So I'm asking, what kind of benefit do you observe? >> >> I don't have measurements at hand, will attach them to v2. >> >> Thanks! >> >> > >> >-- >> >MST >> > >
