Ben Greear wrote:
Back in May of last year, I reported this problem, but worked around it at the time by changing the kernel memory settings in the networking stack. I reproduced the problem again today with the previously working kernel memory settings..which is not supprising since I just papered over the bug last time.
So, I have been poking around. Disabling tso makes the problem happen sooner (< 1 minute). Changing the tcp_congestion_control does not help. Interestingly, I found this page mentioning a SACK problem in Linux: http://www-didc.lbl.gov/TCP-tuning/linux.html I tried disabling SACK, but the problem still happens. However, I do see the CWND go to 1 as soon as the connection stalls (I'm not sure exactly which happens first.) Before the stall, I see CWND reported in the ~40 range. Maybe something similar to the SACK bug can happen on very fast, very low latency links, with large send/receive buffers configured? Thanks, Ben -- Ben Greear <[EMAIL PROTECTED]> Candela Technologies Inc http://www.candelatech.com - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
