On Fri, 3 Oct 2008, Danny Braniss wrote:
it more difficult than I expected.
for one, the kernel date was missleading, the actual source update is the key,
so
the window of changes is now 28/July to 19/August. I have the diffs, but nothing
yet seems relevant.
on the other hand, I tried NFS/TCP, and there things seem ok, ie the
'good' and the 'bad' give the same throughput, which seem to point to UDP
changes ...
Can you post the network-numbers?
so I ran some more test, these are for writes IO:
OK, so it looks like this was almost certainly the rwlock change. What
happens if you pretty much universally substitute the following in
udp_usrreq.c:
Currently Change to
--------- ---------
INP_RLOCK INP_WLOCK
INP_RUNLOCK INP_WUNLOCK
INP_RLOCK_ASSERT INP_WLOCK_ASSERT
Robert N M Watson
Computer Laboratory
University of Cambridge
server is a NetApp:
kernel from 18/08/08 00:00:0 :
/----- UDP ----//---- TCP -------/
1*512 38528 0.19s 83.50MB 0.20s 80.82MB/s
2*512 19264 0.21s 76.83MB 0.21s 77.57MB/s
4*512 9632 0.19s 85.51MB 0.22s 73.13MB/s
8*512 4816 0.19s 83.76MB 0.21s 75.84MB/s
16*512 2408 0.19s 83.99MB 0.21s 77.18MB/s
32*512 1204 0.19s 84.45MB 0.22s 71.79MB/s
64*512 602 0.20s 79.98MB 0.20s 78.44MB/s
128*512 301 0.18s 86.51MB 0.22s 71.53MB/s
256*512 150 0.19s 82.83MB 0.20s 78.86MB/s
512*512 75 0.19s 82.77MB 0.21s 76.39MB/s
1024*512 37 0.19s 85.62MB 0.21s 76.64MB/s
2048*512 18 0.21s 77.72MB 0.20s 80.30MB/s
4096*512 9 0.26s 61.06MB 0.30s 53.79MB/s
8192*512 4 0.83s 19.20MB 0.41s 39.12MB/s
16384*512 2 0.84s 19.01MB 0.41s 39.03MB/s
32768*512 1 0.82s 19.59MB 0.39s 40.89MB/s
kernel from 19/08/08 00:00:00:
1*512 38528 0.45s 35.59MB 0.20s 81.43MB/s
2*512 19264 0.45s 35.56MB 0.20s 79.24MB/s
4*512 9632 0.49s 32.66MB 0.22s 73.72MB/s
8*512 4816 0.47s 34.06MB 0.21s 75.52MB/s
16*512 2408 0.53s 30.16MB 0.22s 72.58MB/s
32*512 1204 0.31s 51.68MB 0.40s 40.14MB/s
64*512 602 0.43s 37.23MB 0.25s 63.57MB/s
128*512 301 0.51s 31.39MB 0.26s 62.70MB/s
256*512 150 0.47s 34.02MB 0.23s 69.06MB/s
512*512 75 0.47s 34.01MB 0.23s 70.52MB/s
1024*512 37 0.53s 30.12MB 0.22s 73.01MB/s
2048*512 18 0.55s 29.07MB 0.23s 70.64MB/s
4096*512 9 0.46s 34.69MB 0.21s 75.92MB/s
8192*512 4 0.81s 19.66MB 0.43s 36.89MB/s
16384*512 2 0.80s 19.99MB 0.40s 40.29MB/s
32768*512 1 1.11s 14.41MB 0.38s 42.56MB/s
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