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authorChristoph Hellwig <hch@lst.de>2018-12-13 18:17:02 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-12-19 07:13:12 +0300
commit2a3d4eb8e228061c09d5ca8bf39e7f00c2091213 (patch)
tree867ce9fbb2ecee876580bb728ef3affb3e1b41d3 /drivers/scsi/advansys.c
parent4dd4130a722fb046e941010cf5576aed252bb58a (diff)
downloadlinux-2a3d4eb8e228061c09d5ca8bf39e7f00c2091213.tar.xz
scsi: flip the default on use_clustering
Most SCSI drivers want to enable "clustering", that is merging of segments so that they might span more than a single page. Remove the ENABLE_CLUSTERING define, and require drivers to explicitly set DISABLE_CLUSTERING to disable this feature. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/advansys.c')
-rw-r--r--drivers/scsi/advansys.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index 223ef6f4e258..95b4793c33f4 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -10808,14 +10808,6 @@ static struct scsi_host_template advansys_template = {
* for non-ISA adapters.
*/
.unchecked_isa_dma = true,
- /*
- * All adapters controlled by this driver are capable of large
- * scatter-gather lists. According to the mid-level SCSI documentation
- * this obviates any performance gain provided by setting
- * 'use_clustering'. But empirically while CPU utilization is increased
- * by enabling clustering, I/O throughput increases as well.
- */
- .use_clustering = ENABLE_CLUSTERING,
};
static int advansys_wide_init_chip(struct Scsi_Host *shost)