On Fri, Feb 05, 2021 at 09:14:28AM +0100, Nicolas Morey-Chaisemartin wrote: > The current code computes a number of channels per SRP target and spreads > them equally across all online NUMA nodes. > Each channel is then assigned a CPU within this node. > > In the case of unbalanced, or even unpopulated nodes, some channels > do not get a CPU associated and thus do not get connected. > This causes the SRP connection to fail. > > This patch solves the issue by rewriting channel computation and allocation: > - Drop channel to node/CPU association as it had > no real effect on locality but added unnecessary complexity. > - Tweak the number of channels allocated to reduce CPU contention when possible: > - Up to one channel per CPU (instead of up to 4 by node) > - At least 4 channels per node, unless ch_count module parameter is used. > > Signed-off-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@xxxxxxxx> > --- > drivers/infiniband/ulp/srp/ib_srp.c | 110 ++++++++++++---------------- > 1 file changed, 45 insertions(+), 65 deletions(-) Bart? Jason
