> > Also, I think you need to provide a block trace (output of > > blktrace/blkparse for the rm -rf workloads) for both the XFS and > > ext4 cases so we can see what discards are actually being issued and > > how long they take to complete.... > Partial xfs results attached this was the overall summary with xfs. The summary looks like this. CPU0 (xfs.trace): Reads Queued: 1,274, 9,216KiB Writes Queued: 9,981, 156,710KiB Read Dispatches: 1,738, 8,656KiB Write Dispatches: 9,855, 157,818KiB Reads Requeued: 495 Writes Requeued: 72 Reads Completed: 1,844, 12,916KiB Writes Completed: 15,486, 8,360KiB Read Merges: 0, 0KiB Write Merges: 42, 364KiB Read depth: 10 Write depth: 11 IO unplugs: 95 Timer unplugs: 3 CPU1 (xfs.trace): Reads Queued: 153, 1,372KiB Writes Queued: 14,521, 183,608KiB Read Dispatches: 235, 2,348KiB Write Dispatches: 15,246, 183,627KiB Reads Requeued: 24 Writes Requeued: 748 Reads Completed: 197, 1,868KiB Writes Completed: 14,885, 11,825KiB Read Merges: 0, 0KiB Write Merges: 19, 60KiB Read depth: 10 Write depth: 11 IO unplugs: 39 Timer unplugs: 7 CPU2 (xfs.trace): Reads Queued: 1,156, 7,520KiB Writes Queued: 10,873, 160,987KiB Read Dispatches: 1,586, 7,416KiB Write Dispatches: 10,724, 160,687KiB Reads Requeued: 446 Writes Requeued: 69 Reads Completed: 586, 3,820KiB Writes Completed: 5,310, 4,103KiB Read Merges: 0, 0KiB Write Merges: 57, 664KiB Read depth: 10 Write depth: 11 IO unplugs: 54 Timer unplugs: 8 CPU3 (xfs.trace): Reads Queued: 126, 1,436KiB Writes Queued: 5,197, 47,004KiB Read Dispatches: 135, 1,124KiB Write Dispatches: 5,388, 46,187KiB Reads Requeued: 20 Writes Requeued: 333 Reads Completed: 82, 940KiB Writes Completed: 5,037, 1,551KiB Read Merges: 0, 0KiB Write Merges: 91, 708KiB Read depth: 10 Write depth: 11 IO unplugs: 50 Timer unplugs: 8 Total (xfs.trace): Reads Queued: 2,709, 19,544KiB Writes Queued: 40,572, 548,309KiB Read Dispatches: 3,694, 19,544KiB Write Dispatches: 41,213, 548,319KiB Reads Requeued: 985 Writes Requeued: 1,222 Reads Completed: 2,709, 19,544KiB Writes Completed: 40,718, 25,839KiB Read Merges: 0, 0KiB Write Merges: 209, 1,796KiB IO unplugs: 238 Timer unplugs: 26 Throughput (R/W): 45KiB/s / 60KiB/s Events (xfs.trace): 309,109 entries Skips: 0 forward (0 - 0.0%) CPU0 (xfs.trace): Reads Queued: 1,274, 9,216KiB Writes Queued: 9,981, 156,710KiB Read Dispatches: 1,738, 8,656KiB Write Dispatches: 9,855, 157,818KiB Reads Requeued: 495 Writes Requeued: 72 Reads Completed: 1,844, 12,916KiB Writes Completed: 15,486, 8,360KiB Read Merges: 0, 0KiB Write Merges: 42, 364KiB Read depth: 10 Write depth: 11 IO unplugs: 95 Timer unplugs: 3 CPU1 (xfs.trace): Reads Queued: 153, 1,372KiB Writes Queued: 14,521, 183,608KiB Read Dispatches: 235, 2,348KiB Write Dispatches: 15,246, 183,627KiB Reads Requeued: 24 Writes Requeued: 748 Reads Completed: 197, 1,868KiB Writes Completed: 14,885, 11,825KiB Read Merges: 0, 0KiB Write Merges: 19, 60KiB Read depth: 10 Write depth: 11 IO unplugs: 39 Timer unplugs: 7 CPU2 (xfs.trace): Reads Queued: 1,156, 7,520KiB Writes Queued: 10,873, 160,987KiB Read Dispatches: 1,586, 7,416KiB Write Dispatches: 10,724, 160,687KiB Reads Requeued: 446 Writes Requeued: 69 Reads Completed: 586, 3,820KiB Writes Completed: 5,310, 4,103KiB Read Merges: 0, 0KiB Write Merges: 57, 664KiB Read depth: 10 Write depth: 11 IO unplugs: 54 Timer unplugs: 8 CPU3 (xfs.trace): Reads Queued: 126, 1,436KiB Writes Queued: 5,197, 47,004KiB Read Dispatches: 135, 1,124KiB Write Dispatches: 5,388, 46,187KiB Reads Requeued: 20 Writes Requeued: 333 Reads Completed: 82, 940KiB Writes Completed: 5,037, 1,551KiB Read Merges: 0, 0KiB Write Merges: 91, 708KiB Read depth: 10 Write depth: 11 IO unplugs: 50 Timer unplugs: 8 Total (xfs.trace): Reads Queued: 2,709, 19,544KiB Writes Queued: 40,572, 548,309KiB Read Dispatches: 3,694, 19,544KiB Write Dispatches: 41,213, 548,319KiB Reads Requeued: 985 Writes Requeued: 1,222 Reads Completed: 2,709, 19,544KiB Writes Completed: 40,718, 25,839KiB Read Merges: 0, 0KiB Write Merges: 209, 1,796KiB IO unplugs: 238 Timer unplugs: 26 Throughput (R/W): 45KiB/s / 60KiB/s Events (xfs.trace): 309,109 entries Skips: 0 forward (0 - 0.0%) CPU0 (xfs.trace): Reads Queued: 1,274, 9,216KiB Writes Queued: 9,981, 156,710KiB Read Dispatches: 1,738, 8,656KiB Write Dispatches: 9,855, 157,818KiB Reads Requeued: 495 Writes Requeued: 72 Reads Completed: 1,844, 12,916KiB Writes Completed: 15,486, 8,360KiB Read Merges: 0, 0KiB Write Merges: 42, 364KiB Read depth: 10 Write depth: 11 IO unplugs: 95 Timer unplugs: 3 CPU1 (xfs.trace): Reads Queued: 153, 1,372KiB Writes Queued: 14,521, 183,608KiB Read Dispatches: 235, 2,348KiB Write Dispatches: 15,246, 183,627KiB Reads Requeued: 24 Writes Requeued: 748 Reads Completed: 197, 1,868KiB Writes Completed: 14,885, 11,825KiB Read Merges: 0, 0KiB Write Merges: 19, 60KiB Read depth: 10 Write depth: 11 IO unplugs: 39 Timer unplugs: 7 CPU2 (xfs.trace): Reads Queued: 1,156, 7,520KiB Writes Queued: 10,873, 160,987KiB Read Dispatches: 1,586, 7,416KiB Write Dispatches: 10,724, 160,687KiB Reads Requeued: 446 Writes Requeued: 69 Reads Completed: 586, 3,820KiB Writes Completed: 5,310, 4,103KiB Read Merges: 0, 0KiB Write Merges: 57, 664KiB Read depth: 10 Write depth: 11 IO unplugs: 54 Timer unplugs: 8 CPU3 (xfs.trace): Reads Queued: 126, 1,436KiB Writes Queued: 5,197, 47,004KiB Read Dispatches: 135, 1,124KiB Write Dispatches: 5,388, 46,187KiB Reads Requeued: 20 Writes Requeued: 333 Reads Completed: 82, 940KiB Writes Completed: 5,037, 1,551KiB Read Merges: 0, 0KiB Write Merges: 91, 708KiB Read depth: 10 Write depth: 11 IO unplugs: 50 Timer unplugs: 8 Total (xfs.trace): Reads Queued: 2,709, 19,544KiB Writes Queued: 40,572, 548,309KiB Read Dispatches: 3,694, 19,544KiB Write Dispatches: 41,213, 548,319KiB Reads Requeued: 985 Writes Requeued: 1,222 Reads Completed: 2,709, 19,544KiB Writes Completed: 40,718, 25,839KiB Read Merges: 0, 0KiB Write Merges: 209, 1,796KiB IO unplugs: 238 Timer unplugs: 26 Throughput (R/W): 45KiB/s / 60KiB/s Events (xfs.trace): 309,109 entries Skips: 0 forward (0 - 0.0%) CPU0 (xfs.trace): Reads Queued: 1,274, 9,216KiB Writes Queued: 9,981, 156,710KiB Read Dispatches: 1,738, 8,656KiB Write Dispatches: 9,855, 157,818KiB Reads Requeued: 495 Writes Requeued: 72 Reads Completed: 1,844, 12,916KiB Writes Completed: 15,486, 8,360KiB Read Merges: 0, 0KiB Write Merges: 42, 364KiB Read depth: 10 Write depth: 11 IO unplugs: 95 Timer unplugs: 3 CPU1 (xfs.trace): Reads Queued: 153, 1,372KiB Writes Queued: 14,521, 183,608KiB Read Dispatches: 235, 2,348KiB Write Dispatches: 15,246, 183,627KiB Reads Requeued: 24 Writes Requeued: 748 Reads Completed: 197, 1,868KiB Writes Completed: 14,885, 11,825KiB Read Merges: 0, 0KiB Write Merges: 19, 60KiB Read depth: 10 Write depth: 11 IO unplugs: 39 Timer unplugs: 7 CPU2 (xfs.trace): Reads Queued: 1,156, 7,520KiB Writes Queued: 10,873, 160,987KiB Read Dispatches: 1,586, 7,416KiB Write Dispatches: 10,724, 160,687KiB Reads Requeued: 446 Writes Requeued: 69 Reads Completed: 586, 3,820KiB Writes Completed: 5,310, 4,103KiB Read Merges: 0, 0KiB Write Merges: 57, 664KiB Read depth: 10 Write depth: 11 IO unplugs: 54 Timer unplugs: 8 CPU3 (xfs.trace): Reads Queued: 126, 1,436KiB Writes Queued: 5,197, 47,004KiB Read Dispatches: 135, 1,124KiB Write Dispatches: 5,388, 46,187KiB Reads Requeued: 20 Writes Requeued: 333 Reads Completed: 82, 940KiB Writes Completed: 5,037, 1,551KiB Read Merges: 0, 0KiB Write Merges: 91, 708KiB Read depth: 10 Write depth: 11 IO unplugs: 50 Timer unplugs: 8 Total (xfs.trace): Reads Queued: 2,709, 19,544KiB Writes Queued: 40,572, 548,309KiB Read Dispatches: 3,694, 19,544KiB Write Dispatches: 41,213, 548,319KiB Reads Requeued: 985 Writes Requeued: 1,222 Reads Completed: 2,709, 19,544KiB Writes Completed: 40,718, 25,839KiB Read Merges: 0, 0KiB Write Merges: 209, 1,796KiB IO unplugs: 238 Timer unplugs: 26 Throughput (R/W): 45KiB/s / 60KiB/s Events (xfs.trace): 309,109 entries Skips: 0 forward (0 - 0.0%) > > > Thanks for the input and patience. > > ~tom > >
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