From: Stephen Hemminger <shemminger@vyatta.com>
To: Jesper Dangaard Brouer <jdb@comx.dk>, Robert Olsson <robert@herjulf.net>
Cc: netdev@vger.kernel.org
Subject: pktgen: tricks
Date: Tue, 22 Sep 2009 22:49:02 -0700 [thread overview]
Message-ID: <20090922224902.17ed6cc4@nehalam> (raw)
I thought others want to know how to get maximum speed of pktgen.
1. Run nothing else (even X11), just a command line
2. Make sure ethernet flow control is disabled
ethtool -A eth0 autoneg off rx off tx off
3. Make sure clocksource is TSC. On my old SMP Opteron's
needed to get patch since in 2.6.30 or later, the clock guru's
decided to remove it on all non Intel machines. Look for patch
than enables "tsc=reliable"
4. Compile Ethernet drivers in, the overhead of the indirect
function call required for modules (or cache footprint),
slows things down.
5. Increase transmit ring size to 1000
ethtool -G eth0 tx 1000
Result: OK: 70408581(c70405979+d2602) nsec, 100000000 (60byte,0frags)
1420281pps 681Mb/sec (681734880bps) errors: 0
next reply other threads:[~2009-09-23 5:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 5:49 Stephen Hemminger [this message]
2009-09-24 0:41 ` pktgen: tricks Stephen Hemminger
2009-09-24 1:05 ` Rick Jones
2009-09-24 10:10 ` Denys Fedoryschenko
2009-09-24 10:32 ` Eric Dumazet
2009-09-30 23:03 ` [PATCH] pktgen: Avoid dirtying skb->users when txq is full Eric Dumazet
2009-10-01 0:25 ` Stephen Hemminger
2009-10-01 9:47 ` [PATCH] pktgen: Fix delay handling Eric Dumazet
2009-10-01 10:04 ` Eric Dumazet
2009-10-01 16:29 ` David Miller
2009-10-01 16:32 ` Eric Dumazet
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