>> I tried a 2.8 client mounting the 2.9 servers and that showed the expected >> behavior ??? increasing >> performance with increasing OST's. Two things: >> >> 1. Any pointers to compiling a 2.8 client on recent RHEL 7 kernels would be >> helpful. I had to boot >> into an older kernel to get the above test done. >> >> 2. Any help to find the problem in the 2.9 code base would also be helpful. > > The fast_read feature has been added to the client-side read path between 2.8 > and 2.9. So for starters it might > be worthwhile to re-run the test on a 2.9 client with fast_read=0?
I've verified that the client compiled with the latest master branch code still reads very fast on 1 OST and slow multiple OSTs. The behavior is the same with fast_read=0 (also with the master branch client). We'll try to isolate the problem with a git bisect. _______________________________________________ lustre-discuss mailing list lustre-discuss@lists.lustre.org http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
