From c12128ce44b04a987c4eb0f733cc99c4dd50d45a Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 13 Jul 2018 16:26:15 +0200 Subject: mt76: use a per rx queue page fragment cache Using the NAPI or netdev frag cache along with other drivers can lead to 32 KiB pages being held for a long time, despite only being used for very few page fragments. This can happen if the driver grabs one or two fragments for rx ring refill, while other drivers use (and free up) the remaining fragments. The 32 KiB higher-order page can only be freed once all users have freed their fragments. Depending on the traffic patterns, this can waste a lot of memory and look a lot like a memory leak. Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mt76.h | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/wireless/mediatek/mt76/mt76.h') diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 56983213093f..dbda49243a10 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -121,6 +121,7 @@ struct mt76_queue { dma_addr_t desc_dma; struct sk_buff *rx_head; + struct page_frag_cache rx_page; }; struct mt76_mcu_ops { -- cgit v1.2.3-55-g7522