> > On Tue, Apr 02, 2013 at 09:51:12PM +0000, Huang, Xiong wrote: > > > The error vanishes as soon as I put a gso size limit of > > > MAX_TX_BUF_LEN in the driver. MAX_TX_BUF_LEN seems to be > arbitrary > > > set to 0x2000. I can even raise it to 0x3000 and don't see any tcp > > > retransmits. Do you have an advice on how to size this value (e.g. should > we switch to the windows values)? > > > > > > > Would you try 0x4000 ? because the buffer-length in TX descriptor is 14bits, > 0x4000 exceeds max value. > > Do you find any bug/issue on the code that calculate the length for each TX > descriptor ? > > Setting MAX_TX_BUF_LEN to 0x4000 > > [ 8949.833750] ATL1E 0000:04:00.0 p33p1: NIC Link is Up <100 Mbps Full > Duplex> [ 8949.833783] IPv6: ADDRCONF(NETDEV_CHANGE): p33p1: link > becomes ready [ 8960.861557] ATL1E 0000:04:00.0 p33p1: PCIE DMA RW error > (status = 0x5000400) [ 8960.866879] ATL1E 0000:04:00.0 p33p1: NIC Link is Up > <100 Mbps Full Duplex> [ 8961.095266] ATL1E 0000:04:00.0 p33p1: PCIE DMA > RW error (status = 0x5000400) [ 8961.100791] ATL1E 0000:04:00.0 p33p1: NIC > Link is Up <100 Mbps Full Duplex> > Hannes, Thanks for your testing !
simply revising MAX_TX_BUF_LEN to 0x4000 will cause incorrect TX configuration... I mean you can try to put a gso size limit of 0x4000 (or 0x5000).... Thanks Xiong