From: Alexander Duyck <[email protected]> Date: Wed, 06 May 2015 21:11:34 -0700
> This patch series addresses several things. > > First I found an issue in the performance of the pfmemalloc check from > build_skb. To work around it I have provided a cached copy of pfmemalloc > to be used in __netdev_alloc_skb and __napi_alloc_skb. > > Second I moved the page fragment allocation logic into the mm tree and > added functionality for freeing page fragments. I had to fix igb before I > could do this as it was using a reference to NETDEV_FRAG_PAGE_MAX_SIZE > incorrectly. > > Finally I went through and replaced all of the duplicate code that was > calling put_page and replaced it with calls to skb_free_frag. > > With these changes in place a simple receive and drop test increased from a > packet rate of 8.9Mpps to 9.8Mpps. The gains breakdown as follows: > > 8.9Mpps Before 9.8Mpps After > ------------------------ ------------------------ > 7.8% put_compound_page 9.1% __free_page_frag > 3.9% skb_free_head > 1.1% put_page > > 4.9% build_skb 3.8% __napi_alloc_skb > 2.5% __alloc_rx_skb > 1.9% __napi_alloc_skb I like this series, but again I need to see feedback from some mm folks before I can consider applying it. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
