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| author |   Giuseppe CAVALLARO <peppe.cavallaro@st.com> | 2011-10-18 01:39:55 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2011-10-19 19:24:18 -0400 |
| commit | 45db81e1590c82ddc735ccd33f8adab02528b3e3 (patch) | |
| tree | c3438feab991a27b0d1a696c8118d5d28f414e03 /net/ipv4/af_inet.c | |
| parent | stmmac: add CHAINED descriptor mode support (V4) (diff) | |
| download | linux-dev-45db81e1590c82ddc735ccd33f8adab02528b3e3.tar.xz linux-dev-45db81e1590c82ddc735ccd33f8adab02528b3e3.zip | |
stmmac: limit max_mtu in case of 4KiB and use __netdev_alloc_skb (V2)
Problem using big mtu around 4096 bytes is you end allocating (4096
+NET_SKB_PAD + NET_IP_ALIGN + sizeof(struct skb_shared_info) bytes ->
8192 bytes : order-1 pages
It's better to limit the mtu to SKB_MAX_HEAD(NET_SKB_PAD),
to have no more than one page per skb.
Also the patch changes the netdev_alloc_skb_ip_align() done in
init_dma_desc_rings() and uses a variant allowing GFP_KERNEL allocations
allowing the driver to load even in case of memory pressure.
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/af_inet.c')
0 files changed, 0 insertions, 0 deletions