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| author | John Garry <john.garry@huawei.com> | 2019-05-29 17:58:44 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-06-18 19:46:24 -0400 |
| commit | c7669f50121ac43d33fe8fe7c38f737c6c35e323 (patch) | |
| tree | 670a9626812eea646a31a690aa24797ee23ba2f0 /drivers/scsi/hisi_sas | |
| parent | 794327ab53cc6b330774d6fdb93b547666583db9 (diff) | |
| download | linux-c7669f50121ac43d33fe8fe7c38f737c6c35e323.tar.gz linux-c7669f50121ac43d33fe8fe7c38f737c6c35e323.tar.bz2 linux-c7669f50121ac43d33fe8fe7c38f737c6c35e323.zip | |
scsi: hisi_sas: Reduce HISI_SAS_SGE_PAGE_CNT in size
Macro HISI_SAS_SGE_PAGE_CNT is defined to SG_CHUNK_SIZE, which is 128.
This means that sizeof(struct hisi_sas_slot_buf_table) is 4192. This is
just over a 4K, which can mean inefficient DMA memory usage (for no PI).
Reduce the size of HISI_SAS_SGE_PAGE_CNT to 124 to fit in a 4K page. With
this change, we experience no performance hit.
Cc: dann frazier <dann.frazier@canonical.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/hisi_sas')
| -rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h index fc87994b5d73..06f22fb372b1 100644 --- a/drivers/scsi/hisi_sas/hisi_sas.h +++ b/drivers/scsi/hisi_sas/hisi_sas.h @@ -484,12 +484,12 @@ struct hisi_sas_command_table_stp { u8 atapi_cdb[ATAPI_CDB_LEN]; }; -#define HISI_SAS_SGE_PAGE_CNT SG_CHUNK_SIZE +#define HISI_SAS_SGE_PAGE_CNT (124) struct hisi_sas_sge_page { struct hisi_sas_sge sge[HISI_SAS_SGE_PAGE_CNT]; } __aligned(16); -#define HISI_SAS_SGE_DIF_PAGE_CNT SG_CHUNK_SIZE +#define HISI_SAS_SGE_DIF_PAGE_CNT HISI_SAS_SGE_PAGE_CNT struct hisi_sas_sge_dif_page { struct hisi_sas_sge sge[HISI_SAS_SGE_DIF_PAGE_CNT]; } __aligned(16); |