On Fri, Jul 13, 2018 at 06:50:02AM -0400, Thor Lancelot Simon wrote: > Only the master does much if any disk (actually SSD) I/O. It must be > either the mpt driver or the scsi subsystem. At a _guess_, mpt? I > don't have time to look right now.
I couldn't spot any special dma map allocations in mpt. > This is annoying, but seems unlikely to be the cause of the performance > regression; I agree, it is just .. strange. > I don't think the master runs builds any more, does it? So > it shouldn't be doing much and should have tons of CPU and memory > bandwidth available to move that data. It does run builds (but only a single instance). spz compared dmesg output with the old kernel and there was nothing obvious in there either. Martin
