Seems counter-logical, but we have testimony that you may need to reduce the prefetchThreads parameter. Of all the parameters, that's the one that directly affects prefetching, so worth trying.
Jan-Frode Myklebust wrote: ...Digging further I found that reducing prefetchThreads from default=72 to 32 also fixed it, while leaving maxMBpS at 10000. Can now also read at 3,2 GByte/s.... I can speculate that having prefetchThreads to high may create a contention situation where more threads causes overall degradation in system performance.
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