mtu 1504 & PKT_BUF_SZ

If I change from default 1500
to:
static const int mtu = 1504;

(to enable vlans to work on my router)

then:

/* Allocation size of Rx buffers with normal sized Ethernet frames.
   Do not change this value without good reason.  The 1536 value is not
   a limit, or directly related to MTU, but rather a way to keep a
   consistent allocation size among drivers.
 */
#define PKT_BUF_SZ              1536

Should I also change PKT_BUF_SZ +4(to 1540) ? Is it a 'good reason' to do it ?

-- 
 Pozdrawiam,
 Bartlomiej Zarzecki                    mailto:[email protected]

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