diff options
| author | James.Smart@Emulex.Com <James.Smart@Emulex.Com> | 2005-10-28 20:29:51 -0400 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-10-29 10:30:12 -0500 |
| commit | a784efbff725b7f4893a8835ac7232c0e00d24e4 (patch) | |
| tree | ea7a50121dbbca571f702a67c246f69eb911f35b /drivers | |
| parent | 68876920f442912c94f749bc337c888696cb9ed0 (diff) | |
[SCSI] lpfc: Adjust lpfc_scsi_buf allocation
Adjust lpfc_scsi_buf allocation to account for lun_queue_depth and
error handling
Under high load and high duress, the error handler could steal some
command resources from the normal i/o path. Rework to allocate
additional resources to avoid this scneario.
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_scsi.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index c993069a650..b903d3b7b73 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -1152,24 +1152,33 @@ lpfc_slave_alloc(struct scsi_device *sdev) /* * Populate the cmds_per_lun count scsi_bufs into this host's globally * available list of scsi buffers. Don't allocate more than the - * HBA limit conveyed to the midlayer via the host structure. Note - * that this list of scsi bufs exists for the lifetime of the driver. + * HBA limit conveyed to the midlayer via the host structure. The + * formula accounts for the lun_queue_depth + error handlers + 1 + * extra. This list of scsi bufs exists for the lifetime of the driver. */ total = phba->total_scsi_bufs; - num_to_alloc = LPFC_CMD_PER_LUN; + num_to_alloc = phba->cfg_lun_queue_depth + 2; if (total >= phba->cfg_hba_queue_depth) { - printk(KERN_WARNING "%s, At config limitation of " - "%d allocated scsi_bufs\n", __FUNCTION__, total); + lpfc_printf_log(phba, KERN_WARNING, LOG_FCP, + "%d:0704 At limitation of %d preallocated " + "command buffers\n", phba->brd_no, total); return 0; } else if (total + num_to_alloc > phba->cfg_hba_queue_depth) { + lpfc_printf_log(phba, KERN_WARNING, LOG_FCP, + "%d:0705 Allocation request of %d command " + "buffers will exceed max of %d. Reducing " + "allocation request to %d.\n", phba->brd_no, + num_to_alloc, phba->cfg_hba_queue_depth, + (phba->cfg_hba_queue_depth - total)); num_to_alloc = phba->cfg_hba_queue_depth - total; } for (i = 0; i < num_to_alloc; i++) { scsi_buf = lpfc_get_scsi_buf(phba); if (!scsi_buf) { - printk(KERN_ERR "%s, failed to allocate " - "scsi_buf\n", __FUNCTION__); + lpfc_printf_log(phba, KERN_ERR, LOG_FCP, + "%d:0706 Failed to allocate command " + "buffer\n", phba->brd_no); break; } |