Re: Throughput regression with `tcp: refine TSO autosizing`
flat view
From: Eric Dumazet <hidden>
Date: 2015-01-30 14:40:35
Also in:
linux-wireless
On Fri, 2015-01-30 at 14:39 +0100, Michal Kazior wrote:
I've briefly tried playing with this knob to no avail unfortunately. I tried 256K, 1M - it didn't improve TCP performance. When I tried to make it smaller (e.g. 16K) the traffic dropped even more so it does have an effect. It seems there's some other limiting factor in this case.
Interesting. Could you take some tcpdump/pcap with various tcp_limit_output_bytes values ? echo 131072 >/proc/sys/net/ipv4/tcp_limit_output_bytes tcpdump -p -i wlanX -s 128 -c 20000 -w 128k.pcap echo 262144 >/proc/sys/net/ipv4/tcp_limit_output_bytes tcpdump -p -i wlanX -s 128 -c 20000 -w 256k.pcap ... Thanks ! -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html