Am Donnerstag, den 21.07.2005, 23:40 +0900 schrieb
hooanon05@xxxxxxxxxxx:
> thank you ming for forwarding mails.
>
> Ming Zhang:
> > Note that the iscsi pdu in #12 is not aligned to the start of the tcp
> > segment since it contains the tail of the previous iscsi PDU starting
> > in packet #2
>
> i have not checked if it is true, but i am afraid that splitting a
> single pdu into multiple packets is iet bug.
As I already wrote before, iSCSI doesn't care about TCP segmentation.
Have a look at Appendix A of the RFC: "[...] The marker uses two copies
of the pointer so that a marker that spans a TCP packet boundary should
leave at least one valid copy in one of the packets. [...]"
Arne
> and i guess the root cause
> is around setting/unsetting TCP_CORK.
> should it be such like this to ensure sending a pdu?
>
> - set CORK.
> - transmit a pdu.
> - set NDELAY.
> - unset CORK.
> - transmit data.
>
> currently, NDELAY is not set and unsetting CORK is done after
> transmitting data.
>
>
> Junjiro Okajima
>
>
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--
Arne Redlich
Xiranet Communications GmbH
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