Ingo Molnar a écrit :
* Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> wrote:
hmmm... Well we are almost there.
2.6.22:
Throughput 2526.15 MB/sec 8 procs
2.6.28-rc5:
Throughput 2486.2 MB/sec 8 procs
8p Dell 1950 and the number of processors specified on the tbench
command line.
And with net-next we might even be able to get past that magic limit?
net-next is linus-latest plus the latest and greatest networking bits:
$ cat .git/config
[remote "net-next"]
url = git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git
fetch = +refs/heads/*:refs/remotes/net-next/*
... so might be worth a test. Just to satisfy our curiosity and to
possibly close the entry :-)
Well, bits in net-next are new stuff for 2.6.29, not really regression fixes,
but yes, they should give nice tbench speedups.
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())
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