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this driver by introducing a flag saying we already stopped the device. On my Soekris net4801, this took a ping -i 0.001 from spending 80% of time in interrupt handling to 10% (approx numbers). This was a particular problem for the net4801 because the tree interfaces share the same interrupt, but it would be a problem for any configuration where an unused if_sis interface shares an interrupt with a busy device. Other drivers may have similar problems. Thanks to: Luigi