DISK OPERATION ERROR when tcp_nagle_limit activated on AIX and PS5000

Hello,

Configuration : 

IBM AIX 6.1

brocade powerconnect 5448

DELL EQUALLOGIC PS5000 and 6000

When tcp_nagle_limit is activate with a value of 1900 like it is recommanded in http://attachments.wetpaintserv.us/ucduNhxD12xwYeDy4TkEkA320298, we are face in a lot of hang (sometimes failure). 

errpt report lot of disk operation errot and software (iscsi) error

IDENTIFIER TIMESTAMP  T C RESOURCE_NAME  DESCRIPTION
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
DCB47997   0910173012 T H hdisk1         DISK OPERATION ERROR
5EB76CCF   0910173012 T H iscsi0         SOFTWARE ERROR
These erros disappear when deactivate tcp_nagle_limit by setting it to zero or setting tcp_nodelay to 1 on the network adapter but i  imagine i miss somme optimization ... 

All informations about that will be  appreciate 

Thanks :)
Philippe