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    Subject[patch,v3,repost 00/10] make I/O path allocations more numa-friendly
    Date
    Hi,

    This patch set makes memory allocations for data structures used in
    the I/O path more numa friendly by allocating them from the same numa
    node as the storage device. I've only converted a handful of drivers
    at this point. My testing is limited by the hardware I have on hand.
    Using these patches, I was able to max out the bandwidth of the storage
    controller when issuing I/O from any node on my 4 node system. Without
    the patch, I/O from nodes remote to the storage device would suffer a
    penalty ranging from 6-12%. Given my relatively low-end setup[1], I
    wouldn't be surprised if others could show a more significant performance
    advantage.

    This is a repost of the last posting. The only changes are additional
    reviewed-by/acked-by tags. I think this version is ready for inclusion.
    James, would you mind taking a look?

    Cheers,
    Jeff

    [1] LSI Megaraid SAS controller with 1GB battery-backed cache,
    fronting a RAID 6 10+2. The workload I used was tuned to not
    have to hit disk. Fio file attached.

    --
    changes from v2->v3:
    - Made the numa_node Scsi_Host structure member dependent on CONFIG_NUMA
    - Got rid of a GFP_ZERO I added accidentally
    changes from v1->v2:
    - got rid of the vfs patch, as Al pointed out some fundamental
    problems with it
    - credited Bart van Assche properly


    Jeff Moyer (10):
    scsi: add scsi_host_alloc_node
    scsi: make __scsi_alloc_queue numa-aware
    scsi: make scsi_alloc_sdev numa-aware
    scsi: allocate scsi_cmnd-s from the device's local numa node
    sd: use alloc_disk_node
    ata: use scsi_host_alloc_node
    megaraid_sas: use scsi_host_alloc_node
    mpt2sas: use scsi_host_alloc_node
    lpfc: use scsi_host_alloc_node
    cciss: use blk_init_queue_node

    drivers/ata/libata-scsi.c | 3 ++-
    drivers/block/cciss.c | 3 ++-
    drivers/scsi/hosts.c | 13 +++++++++++--
    drivers/scsi/lpfc/lpfc_init.c | 10 ++++++----
    drivers/scsi/megaraid/megaraid_sas_base.c | 5 +++--
    drivers/scsi/mpt2sas/mpt2sas_scsih.c | 4 ++--
    drivers/scsi/scsi.c | 16 ++++++++++------
    drivers/scsi/scsi_lib.c | 3 ++-
    drivers/scsi/scsi_scan.c | 4 ++--
    drivers/scsi/sd.c | 2 +-
    include/scsi/scsi_host.h | 28 ++++++++++++++++++++++++++++
    11 files changed, 69 insertions(+), 22 deletions(-)


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