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af6d10345c
In ip6_dst_gc() replace: if (entries > gc_thresh) With: if (entries > ops->gc_thresh) Sending Ipv6 packets in a loop via a raw socket triggers an issue where a route is cloned by ip6_rt_cache_alloc() for each packet sent. This quickly consumes the Ipv6 max_size threshold which defaults to 4096 resulting in these warnings: [1] 99.187805] dst_alloc: 7728 callbacks suppressed [2] Route cache is full: consider increasing sysctl net.ipv6.route.max_size. . . [300] Route cache is full: consider increasing sysctl net.ipv6.route.max_size. When this happens the packet is dropped and sendto() gets a network is unreachable error: remaining pkt 200557 errno 101 remaining pkt 196462 errno 101 . . remaining pkt 126821 errno 101 Implement David Aherns suggestion to remove max_size check seeing that Ipv6 has a GC to manage memory usage. Ipv4 already does not check max_size. Here are some memory comparisons for Ipv4 vs Ipv6 with the patch: Test by running 5 instances of a program that sends UDP packets to a raw socket 5000000 times. Compare Ipv4 and Ipv6 performance with a similar program. Ipv4: Before test: MemFree: 29427108 kB Slab: 237612 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 2881 3990 192 42 2 : tunables 0 0 0 During test: MemFree: 29417608 kB Slab: 247712 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 44394 44394 192 42 2 : tunables 0 0 0 After test: MemFree: 29422308 kB Slab: 238104 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 Ipv6 with patch: Errno 101 errors are not observed anymore with the patch. Before test: MemFree: 29422308 kB Slab: 238104 kB ip6_dst_cache 1912 2528 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 During Test: MemFree: 29431516 kB Slab: 240940 kB ip6_dst_cache 11980 12064 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 After Test: MemFree: 29441816 kB Slab: 238132 kB ip6_dst_cache 1902 2432 256 32 2 : tunables 0 0 0 xfrm_dst_cache 0 0 320 25 2 : tunables 0 0 0 ip_dst_cache 3048 4116 192 42 2 : tunables 0 0 0 Tested-by: Andrea Mayer <andrea.mayer@uniroma2.it> Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230112012532.311021-1-jmaxwell37@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _NET_DST_OPS_H
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#define _NET_DST_OPS_H
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#include <linux/types.h>
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#include <linux/percpu_counter.h>
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#include <linux/cache.h>
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struct dst_entry;
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struct kmem_cachep;
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struct net_device;
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struct sk_buff;
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struct sock;
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struct net;
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struct dst_ops {
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unsigned short family;
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unsigned int gc_thresh;
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void (*gc)(struct dst_ops *ops);
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struct dst_entry * (*check)(struct dst_entry *, __u32 cookie);
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unsigned int (*default_advmss)(const struct dst_entry *);
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unsigned int (*mtu)(const struct dst_entry *);
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u32 * (*cow_metrics)(struct dst_entry *, unsigned long);
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void (*destroy)(struct dst_entry *);
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void (*ifdown)(struct dst_entry *,
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struct net_device *dev, int how);
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struct dst_entry * (*negative_advice)(struct dst_entry *);
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void (*link_failure)(struct sk_buff *);
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void (*update_pmtu)(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb, u32 mtu,
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bool confirm_neigh);
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void (*redirect)(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb);
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int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
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struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
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struct sk_buff *skb,
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const void *daddr);
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void (*confirm_neigh)(const struct dst_entry *dst,
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const void *daddr);
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struct kmem_cache *kmem_cachep;
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struct percpu_counter pcpuc_entries ____cacheline_aligned_in_smp;
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};
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static inline int dst_entries_get_fast(struct dst_ops *dst)
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{
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return percpu_counter_read_positive(&dst->pcpuc_entries);
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}
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static inline int dst_entries_get_slow(struct dst_ops *dst)
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{
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return percpu_counter_sum_positive(&dst->pcpuc_entries);
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}
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#define DST_PERCPU_COUNTER_BATCH 32
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static inline void dst_entries_add(struct dst_ops *dst, int val)
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{
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percpu_counter_add_batch(&dst->pcpuc_entries, val,
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DST_PERCPU_COUNTER_BATCH);
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}
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static inline int dst_entries_init(struct dst_ops *dst)
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{
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return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
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}
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static inline void dst_entries_destroy(struct dst_ops *dst)
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{
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percpu_counter_destroy(&dst->pcpuc_entries);
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}
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#endif
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