Lars Roland <[email protected]> wrote:
>
> We have a bunch of IBM 335/336 used as email (anti-virus/spam)
> gateways. Recently our admin changed the kernel version from version
> 2.4.24 to 2.6.8.1 - this resulted in a massive performance
> degradation. The old system could handle 60.000 emails pr. hour the
> new one could only handle about 30.000 emails (this was tested by
> sampling 60.000 emails and sending them to the server).
>
> After poking a bit around (changing hardware and upgrading bios's) I
> realized that the time spend for writing the files to the disk have
> gone up (multiple small writes seams to kill it)
The driver was broken for a while in a way which caused it to run slowly if
it was linked into the kernel image, but it runs OK if loaded as a module.
<digs around>
Here's a minimal patch - it fixes it, but iirc, this isn't what was merged.
(Or you could just use 2.6.12-rc6).
--- 25/drivers/message/fusion/mptscsih.c~mpt-fusion-speedup 2005-03-22 02:43:24.000000000 -0800
+++ 25-akpm/drivers/message/fusion/mptscsih.c 2005-03-22 02:43:24.000000000 -0800
@@ -96,7 +96,6 @@ MODULE_AUTHOR(MODULEAUTHOR);
MODULE_DESCRIPTION(my_NAME);
MODULE_LICENSE("GPL");
-#ifdef MODULE
static int dv = MPTSCSIH_DOMAIN_VALIDATION;
module_param(dv, int, 0);
MODULE_PARM_DESC(dv, "DV Algorithm: enhanced = 1, basic = 0 (default=MPTSCSIH_DOMAIN_VALIDATION=1)");
@@ -112,7 +111,6 @@ MODULE_PARM_DESC(factor, "Min Sync Facto
static int saf_te = MPTSCSIH_SAF_TE;
module_param(saf_te, int, 0);
MODULE_PARM_DESC(saf_te, "Force enabling SEP Processor: (default=MPTSCSIH_SAF_TE=0)");
-#endif
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
@@ -1477,7 +1475,6 @@ mptscsih_init(void)
": Registered for IOC reset notifications\n"));
}
-#ifdef MODULE
dinitprintk((KERN_INFO MYNAM
": Command Line Args: dv=%d max_width=%d "
"factor=0x%x saf_te=%d\n",
@@ -1487,7 +1484,6 @@ mptscsih_init(void)
driver_setup.max_width = (width) ? 1 : 0;
driver_setup.min_sync_factor = factor;
driver_setup.saf_te = (saf_te) ? 1 : 0;;
-#endif
if(mpt_device_driver_register(&mptscsih_driver,
MPTSCSIH_DRIVER) != 0 ) {
_
-
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