I am running 2.2.10-ac4 + knfsd 1.4.1, and, as for the previous
versions, the server behaves strangely very badly when concurrent
readers are accessing the NFS exported partitions.
Using iozone, I can achieve roughly 6 Mo/s with one reader.
Using many readers (from 2 readers upwards), reading rate
drops to 1,5 Mo/s cumulated. For example, with 3 readers, each
of them reads at 500 Ko/s, and the load of the server climbs to
7+.
Using many iozones locally on the server shows that the cumulated
reading rate is independant (or just with little performance loss)
to the rate obtained with one reader (ie, ~ 10 Mo/s).
So, the problem seems to be the simultaneous NFS accesses (maybe combined
with simultaneous disk accesses).
Any idea ?
A+,
-- Thierry Danis Poste : 53 53 danis@spmo.sagem.fr- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/