From: Tony Battersby <tonyb@cybernetics.com>
To: Matthew Wilcox <matthew@wil.cx>, linux-scsi@vger.kernel.org
Subject: [PATCH] [SCSI] sym53c8xx: increase sg_tablesize for larger data transfers
Date: Thu, 15 Nov 2007 10:06:44 -0500 [thread overview]
Message-ID: <473C6084.2040700@cybernetics.com> (raw)
This patch increases the sg_tablesize for sym53c8xx from 96 to 128,
which enables commands to transfer larger amounts of data (e.g. 512 KB
instead of 384 KB, assuming 4 KB non-adjacent pages).
In the current design of sym53c8xx, SYM_CONF_MAX_SG must be set low
enough so that (sym_fw1.a_size <= PAGE_SIZE) && (sym_fw2.a_size <=
PAGE_SIZE). With SYM_CONF_MAX_SG == 128, sym_fw1.a_size == 3940 and
sym_fw2.a_size == 3576 (plus or minus a few bytes depending on other
configuration options). The a_size values increase by 16 for every
additional sg vector, so SYM_CONF_MAX_SG cannot be set much higher than
128 without making more intrusive changes.
Tested on a LSI 53c1010-66.
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
---
--- linux-2.6.24-rc2-git5/drivers/scsi/sym53c8xx_2/sym53c8xx.h.orig 2007-11-15 09:36:03.000000000 -0500
+++ linux-2.6.24-rc2-git5/drivers/scsi/sym53c8xx_2/sym53c8xx.h 2007-11-15 09:36:11.000000000 -0500
@@ -106,7 +106,7 @@
/*
* Max number of SG entries.
*/
-#define SYM_CONF_MAX_SG (96)
+#define SYM_CONF_MAX_SG (128)
/*
* Driver setup structure.
next reply other threads:[~2007-11-15 15:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-15 15:06 Tony Battersby [this message]
2007-11-15 16:10 ` [PATCH] [SCSI] sym53c8xx: increase sg_tablesize for larger data transfers James Bottomley
2007-11-15 16:38 ` Tony Battersby
2007-11-15 16:57 ` James Bottomley
2007-11-15 19:57 ` Tony Battersby
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