Messages in this thread | | | From | Imran.Patel@nokia ... | Subject | RE: skb allocation problems | Date | Tue, 10 Apr 2001 19:27:29 +0300 |
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> On Mon, Apr 09, 2001 at 07:03:46PM +0300, Imran.Patel@nokia.com wrote: > > I have written a test module which closely mirrors what my > code tries to > > do(attached below). This is what i get: > > > > PRE_R: old skb:c371ee40 new skb:c371ee30 > > I guess oldskb->len is <=0xc, and the slab allocator packs > them near together > in the same zone.
nope. i have checked it, the length of the older skb is perfectly ok.....and i even found that this weird behaviour happens only when the old skb buffer length is between 80 and 224 bytes.
and apart from this problem, i even found out that when i send a packet >= 186 bytes the kernel allocates a lot of memory in the skb...the output from a simple test module is below:
PRE_R: skb: c7aa0da0 skblen: 185 headroom: 32 tailroom: 7 total_len: 224 PRE_R: skb: c7a43020 skblen: 186 headroom: 32 tailroom: 1334 total_len: 1552
This was generated by sending ipv4 ping packets of different sizes...I tested it using 2.4.1 and 2.4.3 on two machines (both dual stack). What the hell's going on :( ???
imran
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