https://bugzilla.kernel.org/show_bug.cgi?id=66611
Bug ID: 66611
Summary: Very Slow I/O performance on SAS1064
Product: IO/Storage
Version: 2.5
Kernel Version: 3.12.2
Hardware: Sparc64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: SCSI
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Hi
I have a sunfire v245 with 4 Sata disks (TOSHIBA MQ01ABB2 0U)
my controller:
0000:0d:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064 PCI-X
Fusion-MPT SAS (rev 02)
[ 86.909571] Fusion MPT SAS Host driver 3.04.20
Moduls load:
mptsas 33574 2
scsi_transport_sas 21704 2 mptsas
mptscsih 17605 1 mptsas
mptbase 53658 3 mptctl,mptsas,mptscsih
scsi_mod 171548 10
sg,scsi_transport_sas,libata,mptctl,mptsas,sd_mod,sr_mod,mptscsih
The kernel is self compiled and i provide the config if needed
Linux hostname 3.12.2 #4 Wed Dec 4 13:45:28 CET 2013 sparc64 GNU/Linux
On Debian 7.2
Test with dd:
# dd if=/dev/zero of=test.dd bs=8k count=1000
1000+0 records in
1000+0 records out
8192000 bytes (8.2 MB) copied, 85.015 s, 96.4 kB/s
# dstat -cdr -D sdb
----total-cpu-usage---- --dsk/sdb-- ---io/sdb--
usr sys idl wai hiq siq| read writ| read writ
11 1 36 52 0 0| 93k 5949B|0.58 0.96
0 0 0 100 0 0| 0 25k| 0 3.00
0 0 0 100 0 0| 0 225k| 0 37.0
0 0 0 100 0 0| 0 528k| 0 68.0
0 0 0 100 0 0| 0 224k| 0 29.0
0 0 0 100 0 0| 0 130k| 0 16.0
0 0 0 100 0 0| 0 0 | 0 0
0 0 0 100 0 0| 0 8192B| 0 1.00
0 0 0 100 0 0| 0 25k| 0 4.00
0 0 0 100 0 0| 0 85k| 0 16.0
0 0 0 100 0 0| 0 87k| 0 11.0
0 0 0 100 0 0| 0 0 | 0 0
0 0 0 100 0 0| 0 8192B| 0 1.00
0 0 0 100 0 0| 0 25k| 0 4.00
0 0 0 100 0 0| 0 26k| 0 5.00
....
Thanks
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