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[SCSI] qla2xxx: Reduce request queue-size overhead with recent ISPs. 

The original code to 'resize request-queues' based on iocb-counts
and employed during early ISP23xx testing was too
overly-pessimistic with regards to latencies in the firmware
pulling requests.  Recent ISPs can easily keep up processing a
stream of commands from an abbreviated (effectively, half the
original size) queue.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Andrew Vasquez 2009-03-24 09:08:15 -07:00 committed by James Bottomley
parent 3d79038f92
commit d743de6675
2 changed files with 6 additions and 64 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/scsi/qla2xxx/qla_def.h
View File

@ -176,8 +176,7 @@
/* ISP request and response entry counts (37-65535) */
#define REQUEST_ENTRY_CNT_2100 128 /* Number of request entries. */
#define REQUEST_ENTRY_CNT_2200 2048 /* Number of request entries. */
#define REQUEST_ENTRY_CNT_2XXX_EXT_MEM 4096 /* Number of request entries. */
#define REQUEST_ENTRY_CNT_24XX 4096 /* Number of request entries. */
#define REQUEST_ENTRY_CNT_24XX 2048 /* Number of request entries. */
#define RESPONSE_ENTRY_CNT_2100 64 /* Number of response entries.*/
#define RESPONSE_ENTRY_CNT_2300 512 /* Number of response entries.*/

67
drivers/scsi/qla2xxx/qla_init.c
View File

@ -20,7 +20,6 @@
* QLogic ISP2x00 Hardware Support Function Prototypes.
*/
static int qla2x00_isp_firmware(scsi_qla_host_t *);
static void qla2x00_resize_request_q(scsi_qla_host_t *);
static int qla2x00_setup_chip(scsi_qla_host_t *);
static int qla2x00_init_rings(scsi_qla_host_t *);
static int qla2x00_fw_ready(scsi_qla_host_t *);
@ -892,62 +891,6 @@ cont_alloc:
htonl(offsetof(struct qla2xxx_fw_dump, isp));
}
/**
* qla2x00_resize_request_q() - Resize request queue given available ISP memory.
* @ha: HA context
*
* Returns 0 on success.
*/
static void
qla2x00_resize_request_q(scsi_qla_host_t *vha)
{
int rval;
uint16_t fw_iocb_cnt = 0;
uint16_t request_q_length = REQUEST_ENTRY_CNT_2XXX_EXT_MEM;
dma_addr_t request_dma;
request_t *request_ring;
struct qla_hw_data *ha = vha->hw;
struct req_que *req = ha->req_q_map[0];
/* Valid only on recent ISPs. */
if (IS_QLA2100(ha) || IS_QLA2200(ha))
return;
/* Retrieve IOCB counts available to the firmware. */
rval = qla2x00_get_resource_cnts(vha, NULL, NULL, NULL, &fw_iocb_cnt,
&ha->max_npiv_vports);
if (rval)
return;
/* No point in continuing if current settings are sufficient. */
if (fw_iocb_cnt < 1024)
return;
if (req->length >= request_q_length)
return;
/* Attempt to claim larger area for request queue. */
request_ring = dma_alloc_coherent(&ha->pdev->dev,
(request_q_length + 1) * sizeof(request_t), &request_dma,
GFP_KERNEL);
if (request_ring == NULL)
return;
/* Resize successful, report extensions. */
qla_printk(KERN_INFO, ha, "Extended memory detected (%d KB)...\n",
(ha->fw_memory_size + 1) / 1024);
qla_printk(KERN_INFO, ha, "Resizing request queue depth "
"(%d -> %d)...\n", req->length, request_q_length);
/* Clear old allocations. */
dma_free_coherent(&ha->pdev->dev,
(req->length + 1) * sizeof(request_t), req->ring,
req->dma);
/* Begin using larger queue. */
req->length = request_q_length;
req->ring = request_ring;
req->dma = request_dma;
}
/**
* qla2x00_setup_chip() - Load and start RISC firmware.
* @ha: HA context
@ -1005,11 +948,11 @@ qla2x00_setup_chip(scsi_qla_host_t *vha)
ha->max_npiv_vports =
MIN_MULTI_ID_FABRIC - 1;
}
if (!fw_major_version) {
qla2x00_resize_request_q(vha);
if (ql2xallocfwdump)
qla2x00_alloc_fw_dump(vha);
}
qla2x00_get_resource_cnts(vha, NULL, NULL,
NULL, NULL, &ha->max_npiv_vports);
if (!fw_major_version && ql2xallocfwdump)
qla2x00_alloc_fw_dump(vha);
}
} else {
DEBUG2(printk(KERN_INFO