=> Alexey's assesment that the culprit might be he might be loosing some
=> of those frags in the backlog
=> What kind of hardware is this thing running on? 1.5 G seems a lot on
=> a regular PC. very Large MTUs?
Supermicro 370DLE motherboard P-III 666MHz
using a pci 64bit 66mhz slot with a Myrinet card.
This board uses the serverworks chipset for PCI and we
have measured 400-500MegaBytes/sec (3.2 - 4.0 Gigabit/sec)
transfer rates across the bus. Our link speed is 2Gigabit/sec.
=> Bob, One of the things that could be done is have the driver stop sending
=> packets after the toplayer gets congested (return is NET_RX_CN_HIGH).
=> linux/include/linux/netdevice.h has the NET_RX_* which are returned
=> by netif_rx()
I'll look at it, but DaveM's zero-copy patches also solved
the packet drop for me. I have not tried yet to put that
patch on my 2.4.2 fixed kernels.