From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx> 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>