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:
thanks,
max
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