[OpenIndiana-discuss] ISCSI SSD Performance

[Grant Albitz]

I am not sure that I can disable flow control since no switch is present. Is it turned on in the host by default?


-----Original Message-----
From: Sašo Kiselkov [mailto:skiselkov.ml at gmail.com] 
Sent: Saturday, February 16, 2013 6:05 PM
To: openindiana-discuss at openindiana.org
Subject: Re: [OpenIndiana-discuss] ISCSI SSD Performance

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

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