Re: Dell R310 - H200 Raid performance problem

[Łukasz Czarniecki]

With following Mike's suggestions it worked.

 could you please change this line
 if (mpii_req_cfg_page(sc, addr, 0, hdr, 1, vpg, pagelen) != 0) {

 to
 if (mpii_req_cfg_page(sc, addr, MPII_PG_POLL, hdr, 1, vpg,
pagelen) != 0) {

 and one more:

 this:
 if (mpii_req_cfg_header(sc, MPII_CONFIG_REQ_PAGE_TYPE_RAID_VOL, 0,
addr, 0, hdr) != 0)
 to:
 if (mpii_req_cfg_header(sc, MPII_CONFIG_REQ_PAGE_TYPE_RAID_VOL, 0,
addr, MPII_PG_POLL, hdr) != 0)


mpii0 at pci2 dev 0 function 0 Symbios Logic SAS2008 rev 0x02: apic 0
int 16 (irq 15)
scsibus0 at mpii0: 42 targets
sd0 at scsibus0 targ 1 lun 0: Dell, Virtual Disk, 1028 SCSI4 0/direct
fixed
sd0: 237824MB, 512 bytes/sec, 487063552 sec total
ses0 at scsibus0 targ 10 lun 0: DP, BACKPLANE, 1.07 SCSI3 13/enclosure
services fixed
ses0: unable to read enclosure configuration

# scsi -f /dev/rsd0c -m 8
IC:  0
ABPF:  0
CAP:  0
DISC:  0
SIZE:  0
WCE:  1
MF:  0
RCD:  0
Demand Retention Priority:  0
Write Retention Priority:  0
Disable Pre-fetch Transfer Length:  65535
Minimum Pre-fetch:  0
Maximum Pre-fetch:  65280
Maximum Pre-fetch Ceiling:  65535
FSW:  0
LBCSS:  0
DRA:  0
Vendor-specific:  0
NV_DIS:  0
Number of Cache Segments:  15
Cache Segment Size:  0

how to manipulate write cache policy?

Lukasz

Re: Dell R310 - H200 Raid performance problem

[Łukasz Czarniecki]

On 17.02.2011 16:22, Mike Belopuhov wrote:

 Lukasz has tested the patch below and it works fine for him.  I don't
 have the hardware myself, so I'm not going to push it for the release,
 but if someone thinks it's worth it, please speak up.

Here are some numbers:

4.8
# time tar xzf ./sys.tar.gz
0m11.06s real 0m0.80s user 0m0.86s system
w/softdeps
0m4.97s real 0m0.68s user 0m0.58s system
Current
0m7.13s real 0m0.75s user 0m0.83s system
w/softdeps
0m3.72s real 0m0.60s user 0m0.37s system

It seems that 4.9 has a lot of improvements.
Big thanks for Mike and all developers.

Lukasz