-----Original Message-----
From: Mike Christie [mailto:micha...@cs.wisc.edu] 
Sent: Tuesday, April 07, 2009 9:00 AM
To: open-iscsi@googlegroups.com
Cc: Karen Xie
Subject: Re: [PATCH 1/1 2.6.30] cxgb3i -- increase command queue depth

Mike Christie wrote:
> k...@chelsio.com wrote:
>> [PATCH 1/1 2.6.30] cxgb3i -- increase command queue depth
>>
>> From: Karen Xie <k...@chelsio.com>
>>
>> From: Karen Xie <k...@chelsio.com>
>>
>> Bump the command queue depth.
>>
>> Signed-off-by: Karen Xie <k...@chelsio.com>
>> ---
>> ---
>>
>>  drivers/scsi/cxgb3i/cxgb3i.h |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>>
>> diff --git a/drivers/scsi/cxgb3i/cxgb3i.h
b/drivers/scsi/cxgb3i/cxgb3i.h
>> index d362860..68ed5db 100644
>> --- a/drivers/scsi/cxgb3i/cxgb3i.h
>> +++ b/drivers/scsi/cxgb3i/cxgb3i.h
>> @@ -34,7 +34,7 @@
>>  #include "cxgb3i_offload.h"
>>  #include "cxgb3i_ddp.h"
>>  
>> -#define CXGB3I_SCSI_QDEPTH_DFLT     128
>> +#define CXGB3I_SCSI_QDEPTH_DFLT     1024
>>  #define CXGB3I_MAX_TARGET   CXGB3I_MAX_CONN
>>  #define CXGB3I_MAX_LUN              512
>>  #define ISCSI_PDU_NONPAYLOAD_MAX \
>>
> 
> Is there a max number of iscsi pdus or scsi commands or skbs or max 
> number of bytes that we can send to the card?

[Karen] There are per-connection limits but they are more related to the
tcp layer (say send and receive windows).

Also is there a limit for each port/scsi_host?

[Karen] The hardware actually does not maintain any iscsi/scsi related
state. For IOs, there is data memory map for directly DMAing data to the
scsi data buffer (for read). But the memory map is not organized
according to # of IOs but rather it is related to the total numbers of
data buffers.

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