On Fri, May 06, 2005 at 08:59:50AM +0200, Marian Durkovic wrote: > Hi all, > > > seems we've found the problem. The performance degradation was happening > it the TX path, due to insufficient setting of TX packet buffer FIFO on the > chip. > > To achieve wirespeed performance, the TX FIFO must be large enough to > accomodate 2 jumbo packets (not just 1 as the driver was assuming). > There was also a typo in the driver, causing the PBA tuning on most > cards to be non-functional. > > Due to above limitation, the 82547 chipset (featuring only 40 KB of > RX/TX FIFO) only supports wirespeed tranfers upto 8 KB TCP payload > (MTU 9000 bytes). > > Please be sure to use em driver version 1.7.41 or newer, either from > the CVS (branch RELENG_4_11) or from Intel's downloads.
Does this also apply to 5.x and above? If no-one else responds in the next few days, can you please submit the patch in PR so it does not get lost? Kris
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