Messages in this thread |  | | Date | Tue, 05 Nov 1996 04:18:36 -0600 | From | Keith Rohrer <> | Subject | Re: X much slower in 2.0.24 than in 1.2.13 |
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Alan Cox wrote: > > > | Interesting. These only change the size of some fields. It may be a field > > | size issue. Note that you dont want to run with that sock.h patch reversed > > | as it lets people crash your machine.. > > > > The 2.0.24 changes to "struct sock" in "linux/include/net/sock.h" push > > its size, in my kernel, up to 0x1fc. This new size, plus the > > "kmalloc"'s "block_header" is just big enough to push "struct sock" > > allocations to the next allocation order. > We hardly ever allocate a struct sock Since the last patch I see to sock.h just adds one field, but adds it in the middle rather than at the tail, that might be shoving something (or many somethings) off the end of a cache line... Has anyone tried optimizing the ordering for cache friendliness, or is it the way it is for some other reason?
Keith
-- Their priests and their friars/Behold me in dread Because I still love you,/My love, and you're dead. ---Dead Can Dance, "I Am Stretched On Your Grave"
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