On 09.01.2012 20:54, Maksim Yevmenkin wrote:
On Wed, Dec 28, 2011 at 2:49 PM, Alexander Motin<m...@freebsd.org> wrote:
Author: mav
Date: Wed Dec 28 22:49:28 2011
New Revision: 228939
URL: http://svn.freebsd.org/changeset/base/228939
Log:
Set maximum I/O size for mps(4) to MAXPHYS. Looking into the code, I see
no reason why it should be limited to 64K of DFLTPHYS. DMA data tag is any
way set to allow MAXPHYS, S/G lists (chain elements) are sufficient and
overflows are also handled. On my tests even 1MB I/Os are working fine.
Reviewed by: ken@
Modified:
head/sys/dev/mps/mps_sas.c
Modified: head/sys/dev/mps/mps_sas.c
==============================================================================
--- head/sys/dev/mps/mps_sas.c Wed Dec 28 22:18:53 2011 (r228938)
+++ head/sys/dev/mps/mps_sas.c Wed Dec 28 22:49:28 2011 (r228939)
@@ -937,6 +937,7 @@ mpssas_action(struct cam_sim *sim, union
cpi->transport_version = 0;
cpi->protocol = PROTO_SCSI;
cpi->protocol_version = SCSI_REV_SPC;
+ cpi->maxio = MAXPHYS;
cpi->ccb_h.status = CAM_REQ_CMP;
break;
}
sorry for the late reply, but can we make in into tunable please? i
have in local tree
--- mps_sas.c.orig 2011-11-17 02:05:04.000000000 -0800
+++ mps_sas.c 2011-12-28 16:05:10.000000000 -0800
@@ -121,6 +121,11 @@
MALLOC_DEFINE(M_MPSSAS, "MPSSAS", "MPS SAS memory");
+int mps_maxio = MAXPHYS;
+TUNABLE_INT("hw.mps.maxio",&mps_maxio);
+SYSCTL_INT(_hw_mps, OID_AUTO, maxio, CTLFLAG_RD,&mps_maxio, 0,
+ "CAM maxio override\n");
+
static __inline int mpssas_set_lun(uint8_t *lun, u_int ccblun);
static struct mpssas_target * mpssas_alloc_target(struct mpssas_softc *,
struct mpssas_target *);
@@ -938,6 +943,7 @@
cpi->protocol = PROTO_SCSI;
cpi->protocol_version = SCSI_REV_SPC;
cpi->ccb_h.status = CAM_REQ_CMP;
+ cpi->maxio = mps_maxio;
break;
}
case XPT_GET_TRAN_SETTINGS:
We can. but could you explain why? Have you found any problems this change?
--
Alexander Motin
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