Messages in this thread | | | Date | Fri, 21 Nov 2008 01:05:08 -0800 (PST) | Subject | Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28 | From | David Miller <> |
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From: Eric Dumazet <dada1@cosmosbay.com> Date: Fri, 21 Nov 2008 09:51:32 +0100
> Now, I wish sockets and pipes not going through dcache, not tbench affair > of course but real workloads... > > running 8 processes on a 8 way machine doing a > > for (;;) > close(socket(AF_INET, SOCK_STREAM, 0)); > > is slow as hell, we hit so many contended cache lines ... > > ticket spin locks are slower in this case (dcache_lock for example > is taken twice when we allocate a socket(), once in d_alloc(), another one > in d_instantiate())
As you of course know, this used to be a ton worse. At least now these things are unhashed. :)
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