Very poor performance from Dell/LSI Logic SAS 3000 series SATA/SAS RAID controller FreeBSD 6.3

[Warren Guy]

Scott,

Thanks a lot for that. This seems to have alleviated the problem, I'm seeing
decent performance now in my limited benchmark. It seems quite odd to me that
the write cache is not enabled by default, but oh well.

Thanks again for your help!

Warren

Scott Long wrote:
> Add the following to /boot/loader.conf:
> 
> hw.mpt.enable_sata_wc=1
> 
> 
> Scott
> 
> 
> Warren Guy wrote:
>> Hi,
>>
>> We have a few recently acquired Dell Poweredge SC440 machines in our
>> office
>> running FreeBSD 6.3 that are experiencing very poor disk performance.
>> The RAID
>> controller they are supplied with appears to be an "LSI Logic SAS 3000
>> Series".
>> There are two 250GB SATA disks in RAID 1 configuration. 6-7MB/s seems
>> to be the
>> best I can get out of them. A Linux 2.6 machine with identical
>> hardware and
>> disk/controller configuration exhibits no such performance impediments.
>>
>> Any information or pointers are greatly appreciated.
>>
>> bonnie++ output:
>>
>> Version 1.93c       ------Sequential Output------ --Sequential Input-
>> --Random-
>> Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
>> --Seeks--
>> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP 
>> /sec %CP
>> eva.internal   300M   306  99  6722   1  5591   1   533  99 +++++ +++ 
>> 2359  37
>> Latency             26715us     157ms    2193ms   25385us     808us   
>> 3852us
>> Version 1.93c       ------Sequential Create------ --------Random
>> Create--------
>> eva.internal        -Create-- --Read--- -Delete-- -Create-- --Read---
>> -Delete--
>>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP 
>> /sec %CP
>>                  16  4572  11 +++++ +++ +++++ +++  3019   7 +++++ +++
>> 28367  40
>> Latency              1277ms      23us      33us    1396ms     
>> 92us     317ms
>> 1.93c,1.93c,eva.internal,1,1211281869,300M,,306,99,6722,1,5591,1,533,99,+++++,+++,2359,37,16,,,,,4572,11,+++++,+++,+++++,+++,3019,7,+++++,+++,28367,40,26715us,157ms,2193ms,25385us,808us,3852us,1277ms,23us,33us,1396ms,92us,317ms
>>
>>
>> and bonnie++ from the Linux 2.6 machine:
>>
>> Version  1.03       ------Sequential Output------ --Sequential Input-
>> --Random-
>>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
>> --Seeks--
>> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP 
>> /sec %CP
>> webvms         300M 41255  78 114551  26 565402  88 52867  94 +++++
>> +++ +++++ +++
>>                     ------Sequential Create------ --------Random
>> Create--------
>>                     -Create-- --Read--- -Delete-- -Create-- --Read---
>> -Delete--
>>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP 
>> /sec %CP
>>                  16  3571  95 +++++ +++ +++++ +++  3543  92 +++++ +++
>> 10787  82
>> webvms,300M,41255,78,114551,26,565402,88,52867,94,+++++,+++,+++++,+++,16,3571,95,+++++,+++,+++++,+++,3543,92,+++++,+++,10787,82
>>
>>
>>
>>
>> uname:
>> FreeBSD eva.internal 6.3-RELEASE-p1 FreeBSD 6.3-RELEASE-p1 #0: Wed Feb 13
>> 02:56:56 UTC 2008    
>> root at i386-builder.daemonology.net:/usr/obj/usr/src/sys/SMP
>>  i386
>>
>> from dmesg:
>> CPU: Intel(R) Xeon(R) CPU            3050  @ 2.13GHz (2128.01-MHz
>> 686-class CPU)
>> real memory  = 2145894400 (2046 MB)
>> avail memory = 2090598400 (1993 MB)
>> ...
>> mpt0: <LSILogic SAS/SATA Adapter> port 0xdc00-0xdcff mem
>> 0xefdec000-0xefdeffff,0xefdf0000-0xefdfffff irq 16 at device 8.0 on pci2
>> mpt0: [GIANT-LOCKED]
>> mpt0: MPI Version=1.5.13.0
>> mpt0: mpt_cam_event: 0x16
>> mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required).
>> mpt0: mpt_cam_event: 0x12
>> mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required).
>> mpt0: mpt_cam_event: 0x12
>> mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required).
>> mpt0: mpt_cam_event: 0x16
>> mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required).
>> ...
>> da0 at mpt0 bus 0 target 0 lun 0
>> da0: <Dell VIRTUAL DISK 1028> Fixed Direct Access SCSI-5 device
>> da0: 300.000MB/s transfers, Tagged Queueing Enabled
>> da0: 237464MB (486326272 512 byte sectors: 255H 63S/T 30272C)
>>
>> pciconf:
>> mpt0 at pci2:8:0:    class=0x010000 card=0x1f091028 chip=0x00541000
>> rev=0x01 hdr=0x00
>>     vendor     = 'LSI Logic (Was: Symbios Logic, NCR)'
>>     device     = 'SAS 3000 series, 8-port with 1068 -StorPort'
>>     class      = mass storage
>>     subclass   = SCSI
>>
> 


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