hi sven,
> the very first thing you should check is if you have this setting set : maybe the very first thing to check should be the faq/wiki that has this documented? > > mmlsconfig envVar > > envVar MLX4_POST_SEND_PREFER_BF 0 MLX4_USE_MUTEX 1 MLX5_SHUT_UP_BF 1 > MLX5_USE_MUTEX 1 > > if that doesn't come back the way above you need to set it : > > mmchconfig envVar="MLX4_POST_SEND_PREFER_BF=0 MLX5_SHUT_UP_BF=1 > MLX5_USE_MUTEX=1 MLX4_USE_MUTEX=1" i just set this (wasn't set before), but problem is still present. > > there was a problem in the Mellanox FW in various versions that was never > completely addressed (bugs where found and fixed, but it was never fully > proven to be addressed) the above environment variables turn code on in the > mellanox driver that prevents this potential code path from being used to > begin with. > > in Spectrum Scale 4.2.4 (not yet released) we added a workaround in Scale > that even you don't set this variables the problem can't happen anymore > until then the only choice you have is the envVar above (which btw ships as > default on all ESS systems). > > you also should be on the latest available Mellanox FW & Drivers as not all > versions even have the code that is activated by the environment variables > above, i think at a minimum you need to be at 3.4 but i don't remember the > exact version. There had been multiple defects opened around this area, the > last one i remember was : we run mlnx ofed 4.1, fw is not the latest, but we have edr cards from dell, and the fw is a bit behind. i'm trying to convince dell to make new one. mellanox used to allow to make your own, but they don't anymore. > > 00154843 : ESS ConnectX-3 performance issue - spinning on pthread_spin_lock > > you may ask your mellanox representative if they can get you access to this > defect. while it was found on ESS , means on PPC64 and with ConnectX-3 > cards its a general issue that affects all cards and on intel as well as > Power. ok, thanks for this. maybe such a reference is enough for dell to update their firmware. stijn > > On Wed, Aug 2, 2017 at 8:58 AM Stijn De Weirdt <[email protected]> > wrote: > >> hi all, >> >> is there any documentation wrt data integrity in spectrum scale: >> assuming a crappy network, does gpfs garantee somehow that data written >> by client ends up safe in the nsd gpfs daemon; and similarly from the >> nsd gpfs daemon to disk. >> >> and wrt crappy network, what about rdma on crappy network? is it the same? >> >> (we are hunting down a crappy infiniband issue; ibm support says it's >> network issue; and we see no errors anywhere...) >> >> thanks a lot, >> >> stijn >> _______________________________________________ >> gpfsug-discuss mailing list >> gpfsug-discuss at spectrumscale.org >> http://gpfsug.org/mailman/listinfo/gpfsug-discuss >> > > > > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss > _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
