Messages in this thread | | | Date | Sun, 7 Apr 2002 23:14:57 -0600 | From | Richard Gooch <> | Subject | Re: [patch] ns83820 0.17 (Re: Broadcom 5700/5701 Gigabit Ethernet Adapters) |
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Benjamin LaHaise writes: > On Sun, Mar 10, 2002 at 06:30:33PM -0800, David S. Miller wrote: > > Syskonnect sk98 with jumbo frames gets ~107MB/sec TCP bandwidth > > without NAPI, there is no reason other cards cannot go full speed as > > well. > > > > NAPI is really only going to help with high packet rates not with > > thinks like raw bandwidth tests. > > A day's tweaking later, and I'm getting 810mbit/s with netperf > between two Athlons with default settings (1500 byte packets). What > I've found is that increasing the size of the RX/TX rings or the max > sizes of the tcp r/wmem backlogs really slows things down, so I'm > not doing that anymore. The pair of P3s shows 262mbit/s (up from > 67).
Just a public word of thanks to Ben for improving the driver. I've got 7 shiny new Addtron cards (aka "El Cheapo":-) and with 2.4.19-pre6 I'm getting TCP bandwidths of 69 MB/s (PIII 450 SMP to Athalon 500 UP) and 52 MB/s (Athalon 500 UP to PIII 450 SMP). CONFIG_DEBUG_SLAB=n. This is with two 16 m runs of Category 5 cable (still waiting for the Cat 6). MTU=1500.
Only half of the theoretical bandwidth, but, hey, it's heaps better than 100 Mb/s. Hopefully the remaining 50% will be reclaimed after more hackery (and/or NAPI). Being on a mixed 10/100/1000 Mb/s network means that I'm stuck with MTU=1500.
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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