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Date: Tue, 19 Apr 2011 11:35:15 +0200 From: Michal Simek <monstr@...str.eu> To: netdev@...r.kernel.org Subject: Add NAPI support to ll_temac driver Hi, I would like to try to add NAPI support for ll_temac and look if help us to improve performance on Microblaze system. I would expect that bandwidth should be increased. We have the second non mainline driver which use tasklets and it provides better performance than mainline driver but not so big that's why I think that NAPI can increase performance. Can you please point me to any driver which I could use as a template? Or any developer guide to do so. Do you know any other option how to improve driver performance on low speed cpu? I have found that driver spends a lot of time on skb allocation and preallocated SKBs help a little bit. I have done a test where I increased number of preallocated BDs(SKBs) for rx to 35000 and disable new BD(SKB) allocation in rx_irq. 35000 BDs is setup because I need them to successfully finish netperf test. I have got 25% bandwidth increasing. It will be also nice to be able to allocate several BDs(SKBs) which could be faster than allocate them in sequence. Thanks, Michal -- Michal Simek, Ing. (M.Eng) w: www.monstr.eu p: +42-0-721842854 Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/ Microblaze U-BOOT custodian -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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