> AK> To align the timestamp option to a 32bit boundary. Many CPUs get
> AK> a significant slowdown while accessing non aligned data.
>
> OK, but now there are nop,nop,timestamp or even
> nop,nop.timestamp,nop,nop,[|tcp] options by default.
> (BTW, what's [|tcp] ?)
>
> This seems to forbid sacks from being used. SackOK is used in SYN packets,
> this is not a problem. But I can see sack options only when timestamps
> are off. Do they take too much room or is there another reason?
[|tcp] means that tcpdump did not get all tcp options. Increase the
snaplen with -s and you'll see them all, including the SACKs.
-A.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu