[OpenIndiana-discuss] ISCSI SSD Performance

[Sašo Kiselkov]

On 02/16/2013 11:58 PM, Sašo Kiselkov wrote:
> On 02/16/2013 11:37 PM, Ian Collins wrote:
>> Have you tried the connecting to the volume form another IO host to
>> eliminate vmware as the cause?
> 
> Second that.
> 
> The 9k MTU might also be hitting some NIC driver bugs - non-standard
> settings can, at times. Since the difference is only in the storage ->
> VMware direction, I suspect there may be some trouble there (perhaps
> VMware not being entirely okay with how OI is handling the 9k MTUs?).

One more thing comes to mind: if all else fails, try to disable flow
control. Sometimes it can mess up throughput, if the receiving NIC
erratically sends too many TX frames - can be a driver issue in VMware,
though this is quite a long stretch.

Anyway, right now I suspect VMware might be the culprit here. The number
of kittens that have to be slaughtered to get such a high packet
switching performance from VMs to storage is astounding.

Cheers,
--
Saso