+Cc Konstantin 14/08/2019 10:54, Feifei Wang: > The cache-misses problem is very serious when the function > lpm_cb_parse_ptype is called to read the content of packets. That is > because the contents of packages previously stored in the cache are > overwritten by the following instructions or variables. > Thus the prefetch order can be used to prefetch the next packet into > the cache to avoid CPU spending too much time on it. > > On Octeon TX platform with built-in NIC, 12% performance gain was > measured by running RFC2544 NDR test with l3fwd. Furthermore, the > cache-misses event of the function lpm_cb_parse_ptype was reduced by > 20%, and the CPU task-clock of it dropped from 16.49% to 11.3%, based > on the forwarding test for one minute with the 64B packet. > On the dpaa2 platform, no performance improvement nor drop were seen > with this patch by running RFC2544 NDR test with l3fwd. > On the x86 platform, 15.7% performance gain was measured by running > RFC2544 NDR test with l3fwd. > > Signed-off-by: Feifei Wang <[email protected]> > Reviewed-by: Gavin Hu <[email protected]> > Reviewed-by: Ruifeng Wang <[email protected]> > Reviewed-by: Phil Yang <[email protected]>
Let's test this "improvement" with 19.11-rc1. If a drawback is seen, the patch can be reverted. Applied, thanks
