Messages in this thread | | | Date | Thu, 26 Sep 2002 11:38:15 -0700 (PDT) | From | Venkatesh Rao <> | Subject | Problems with tcp_retransmit_skb |
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Hi, I have a strange problem with tcp_retransmit_skb. I will describe my setup before i describe my problem.
Setup: ucLinux 2.4.10 based kernel running on a embedded processor (coldfire) with 40 MIPS processing capablity.
Problem: This embedded system sends relatively huge amount of data (~1.5MB/s) over ethernet to a remote system which process the data. On a normal case it all works great. But when there is a lot of traffic on the network (simulated by running flood ping between two desktop linux systems connected to the same hub as this embedded system), embedded systems Linux TCP/IP stack go haywire.
More details: Since there is a high traffic on the network, the embedded system cannot transmit packet and this triggers tcp retransmit in the stack.
But the first check on the tcp_transmit_skb fails
if (atomic_read(&sk->wmem_alloc) > min_t(int, sk->wmem_queued+(sk->wmem_queued>>2),sk->sndbuf))
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