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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2006-10-01 12:00:47 +0200
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-10-03 09:16:48 -0500
commit8f6fd19f1f7ab1dab225845464c96cba36a18533 (patch)
tree5619fe5cd72a49cc5d3a9edd0f7c82b1bc0733d6 /drivers/scsi/tmscsim.c
parentf70cfa9bef432d7aeb4e35c093ac27fd6f071d7e (diff)
downloadlwn-8f6fd19f1f7ab1dab225845464c96cba36a18533.tar.gz
lwn-8f6fd19f1f7ab1dab225845464c96cba36a18533.zip
[SCSI] enable clustering for tmscsim
following an email from John Adams <johna@onevista.com> to me with a patch to enable tmscsim to use blocks up to 1MB and a discussion on linux-scsi, below is a patch to enable clustering for tmscsim. I made it switchable with a module parameter, with default "enable" - in case somebody gets problems with it. Unfortunately, I was not able to check if this alone lets you use any bigger blocks with a tape, as my tape seems to only support 1 block size - only "mt setblk 1" is successful, any other value fails. OTOH, testing on a P-133 showed that enabling clustering alone improves throughput by 10% and reduces CPU load by another 10%, so, seems a worthy thing to do. As for setting max_sectors, that might become a separate patch... Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/tmscsim.c')
-rw-r--r--drivers/scsi/tmscsim.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/scsi/tmscsim.c b/drivers/scsi/tmscsim.c
index 9404ff3d4c79..028d5f641cc6 100644
--- a/drivers/scsi/tmscsim.c
+++ b/drivers/scsi/tmscsim.c
@@ -279,6 +279,10 @@ static void dc390_ResetDevParam(struct dc390_acb* pACB);
static u32 dc390_laststatus = 0;
static u8 dc390_adapterCnt = 0;
+static int disable_clustering;
+module_param(disable_clustering, int, S_IRUGO);
+MODULE_PARM_DESC(disable_clustering, "If you experience problems with your devices, try setting to 1");
+
/* Startup values, to be overriden on the commandline */
static int tmscsim[] = {-2, -2, -2, -2, -2, -2};
@@ -2299,7 +2303,7 @@ static struct scsi_host_template driver_template = {
.this_id = 7,
.sg_tablesize = SG_ALL,
.cmd_per_lun = 1,
- .use_clustering = DISABLE_CLUSTERING,
+ .use_clustering = ENABLE_CLUSTERING,
};
/***********************************************************************
@@ -2525,6 +2529,8 @@ static int __devinit dc390_probe_one(struct pci_dev *pdev,
pci_set_master(pdev);
error = -ENOMEM;
+ if (disable_clustering)
+ driver_template.use_clustering = DISABLE_CLUSTERING;
shost = scsi_host_alloc(&driver_template, sizeof(struct dc390_acb));
if (!shost)
goto out_disable_device;
@@ -2660,6 +2666,10 @@ static struct pci_driver dc390_driver = {
static int __init dc390_module_init(void)
{
+ if (!disable_clustering)
+ printk(KERN_INFO "DC390: clustering now enabled by default. If you get problems load\n"
+ "\twith \"disable_clustering=1\" and report to maintainers\n");
+
if (tmscsim[0] == -1 || tmscsim[0] > 15) {
tmscsim[0] = 7;
tmscsim[1] = 4;