>Ok, so this is with a virtio-blk backend, yes..? Yes, it is a virtio-blk backend. > For reference, please >send along the: > > head /sys/block/$VIRTIO_BLK/queue/* > >output in order to see what hardware limits are reported to block. Here is the output for one of the virtio devices: ==> /sys/block/vdb/queue/add_random <== 1 ==> /sys/block/vdb/queue/discard_granularity <== 0 ==> /sys/block/vdb/queue/discard_max_bytes <== 0 ==> /sys/block/vdb/queue/discard_zeroes_data <== 0 ==> /sys/block/vdb/queue/hw_sector_size <== 512 ==> /sys/block/vdb/queue/iosched <== head: error reading `/sys/block/vdb/queue/iosched': Is a directory ==> /sys/block/vdb/queue/iostats <== 1 ==> /sys/block/vdb/queue/logical_block_size <== 512 ==> /sys/block/vdb/queue/max_hw_sectors_kb <== 2147483647 ==> /sys/block/vdb/queue/max_integrity_segments <== 0 ==> /sys/block/vdb/queue/max_sectors_kb <== 512 ==> /sys/block/vdb/queue/max_segments <== 126 ==> /sys/block/vdb/queue/max_segment_size <== 4294967295 ==> /sys/block/vdb/queue/minimum_io_size <== 512 ==> /sys/block/vdb/queue/nomerges <== 0 ==> /sys/block/vdb/queue/nr_requests <== 128 ==> /sys/block/vdb/queue/optimal_io_size <== 0 ==> /sys/block/vdb/queue/physical_block_size <== 512 ==> /sys/block/vdb/queue/read_ahead_kb <== 128 ==> /sys/block/vdb/queue/rotational <== 1 ==> /sys/block/vdb/queue/rq_affinity <== 1 ==> /sys/block/vdb/queue/scheduler <== noop deadline [cfq] >Just to double check, please confirm if huge pages is enabled/disabled >on this machine..? [root@hydra-2-target-server ~]# cat /sys/devices/system/node/node*/meminfo | fgrep Huge Node 0 AnonHugePages: 0 kB Node 0 HugePages_Total: 0 Node 0 HugePages_Free: 0 Node 0 HugePages_Surp: 0 [root@hydra-2-target-server ~]# cat /proc/sys/vm/nr_hugepages 0 >So I'll try to reproduce using some different combinations of >fabric_max_sectors, but for the moment please apply the following debug >patch to dump struct scatterlist + struct bio members and try to >reproduce. Am working on applying the patch now, and will get back to you when I have a result. Regards, Kelsey -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
