Why VMware Virtual disk so slow (da0: 3.300MB/s transfers) ?

[Dongsheng Song]

On Sat, Aug 24, 2013 at 11:52 AM, Sascha Wildner <saw at online.de> wrote:
> On Mon, 19 Aug 2013 09:55:12 +0200, Dongsheng Song
> <dongsheng.song at gmail.com> wrote:
>
>> Hi,
>>
>> When I running DragonFlyBSD under VMware ESXi 5.1, with the following
>> setting:
>>
>> CPUs: 8
>> Memory: 4096 MB
>> SCSI controller: LSI Logic Paraller
>> SCSI disk size: 64G
>>
>> I found this VM is very very slowly, then I check the dmesg output,
>> I'm very surprised:
>>
>> da0: 3.300MB/s transfers
>
>
> Could you try with this patch please?
>
> http://leaf.dragonflybsd.org/~swildner/cam_probe.diff
>
> Sascha

No IO speed difference (still 0.200 ~ 0.400 MB/s with direct IO).

The dmesg output just add new line:
da0: Command Queueing Enabled

# dmesg | grep -E "da0|mpt0"
mpt0: <LSILogic 1030 Ultra4 Adapter> port 0x1400-0x14ff mem
0xd0020000-0xd003ffff,0xd0040000-0xd005ffff irq 11 at device 16.0 on
pci0
mpt0: MPI Version=1.2.0.0
disk scheduler: set policy of da0 to noop
da0 at mpt0 bus 0 target 0 lun 0
da0: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device
da0: 3.300MB/s transfers
da0: Command Queueing Enabled
da0: 65536MB (134217728 512 byte sectors: 255H 63S/T 8354C)
Mounting root from ufs:/dev/da0s1a