On Sun, 13 Jul 2008, Denys Fedoryshchenko wrote:
On Sunday 13 July 2008, Evgeniy Polyakov wrote:
On Sat, Jul 12, 2008 at 05:40:25PM +0300, Denys Fedoryshchenko (denys@xxxxxxxxxxx) wrote:
Seems i found something. After issuing ethtool -K lo tso on i got significant performance improvement.
Why it is not on by default?
Without it performance is VERY poor.
TSO over loopback turns to be GSO, which allows to aggregate multiple
packets into single frame. If system is not CPU bound, then it is likely
REDIRECT problem. If I understood you corerctly, loopback performance is
always good without REDIRECT, but fails to miserable level when
apprpriate rule is used?
No, seems it has performance issues without redirect(and conntrack unloaded too) even, iperf results on loopback is very unstable.
Actually i dont understand, how on idle machine with Xeon processor iperf over loopback (tcp) can be ~100Mbps?
I think it is a bug.
Something is wrong here as:
root@fw2-t:~# iperf -c 127.1
------------------------------------------------------------
Client connecting to 127.1, TCP port 5001
TCP window size: 49.2 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 36419 connected with 127.0.0.1 port 5001
[ 3] 0.0-10.0 sec 7.10 GBytes 6.10 Gbits/sec
# uname -r
2.6.24.7-o4
# grep "model name" /proc/cpuinfo|uniq
model name : Intel(R) Xeon(R) CPU X5460 @ 3.16GHz
Best regards,
Krzysztof Olędzki
