On 08/18/15 14:53, Rick Macklem wrote:
2572 ifp->if_hw_tsomax = 65518;
>2573 ifp->if_hw_tsomaxsegcount = IXGBE_82599_SCATTER;
>2574 ifp->if_hw_tsomaxsegsize = 2048;
Hi,
If IXGBE_82599_SCATTER is the maximum scatter/gather entries the
hardware can do, remember to subtract one fragment for the TCP/IP-header
mbuf!
I think there is an off-by-one here:
ifp->if_hw_tsomax = 65518;
ifp->if_hw_tsomaxsegcount = IXGBE_82599_SCATTER - 1;
ifp->if_hw_tsomaxsegsize = 2048;
Refer to:
*
* NOTE: The TSO limits only apply to the data payload part of
* a TCP/IP packet. That means there is no need to subtract
* space for ethernet-, vlan-, IP- or TCP- headers from the
* TSO limits unless the hardware driver in question requires
* so.
In sys/net/if_var.h
Thank you!
--HPS
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