Re: high load, no bottleneck

[manu%netbsd.org@localhost (Emmanuel Dreyfus)]

Edgar Fuß <ef%math.uni-bonn.de@localhost> wrote:

> > 35685270 bytes/sec
> That's OK.
> 
> > Note I removed -o log
> Shouldn't make a difference, I think.

I re-enabled -o log and did the dd test again on NetBSD 6.0 with the
patch you posted and vfs.wapbl.verbose_commit=2

# dd if=/dev/zero bs=64k of=out count=10000   
10000+0 records in
10000+0 records out
655360000 bytes transferred in 17.331 secs (37814321 bytes/sec)

kernel log:
wapbl_flush: 1379547406.828798896 this transaction = 168960 bytes
wapbl_cache_sync: 1: dev 0x1208 0.141346518
wapbl_cache_sync: 2: dev 0x1208 0.052974853
/ 168960 bytes 0.468 secs 0.361 MB/sec
wapbl_flush: 1379547409.299850220 this transaction = 323072 bytes
wapbl_cache_sync: 1: dev 0x120c 0.253761121
wapbl_cache_sync: 2: dev 0x120c 0.022943043
/home 323072 bytes 0.719 secs 0.449 MB/sec
wapbl_flush: 1379547417.023140298 this transaction = 136192 bytes
wapbl_cache_sync: 1: dev 0x1208 0.239226048
wapbl_cache_sync: 2: dev 0x1208 0.058130346
/ 136192 bytes 0.480 secs 0.283 MB/sec
wapbl_flush: 1379547420.514618291 this transaction = 338944 bytes
wapbl_cache_sync: 1: dev 0x120c 0.207321357
wapbl_cache_sync: 2: dev 0x120c 0.022987705
/home 338944 bytes 0.563 secs 0.602 MB/sec

Running my stress test, which drives load to insane values:
wapbl_flush: 1379547625.571507421 this transaction = 373760 bytes
wapbl_cache_sync: 1: dev 0x120c 0.099539954
wapbl_cache_sync: 2: dev 0x120c 0.009327683
/home 373760 bytes 0.132 secs 2.831 MB/sec
wapbl_flush: 1379547625.741582309 this transaction = 341504 bytes
wapbl_cache_sync: 1: dev 0x120c 0.136495561
wapbl_cache_sync: 2: dev 0x120c 0.009992682
/home 341504 bytes 0.168 secs 2.032 MB/sec
wapbl_flush: 1379547625.921656139 this transaction = 273408 bytes
wapbl_cache_sync: 1: dev 0x120c 0.147418701
wapbl_cache_sync: 2: dev 0x120c 0.010158968
/home 273408 bytes 0.178 secs 1.536 MB/sec
wapbl_flush: 1379547626.111737705 this transaction = 375808 bytes
wapbl_cache_sync: 1: dev 0x120c 0.116060286
wapbl_cache_sync: 2: dev 0x120c 0.006006430
/home 375808 bytes 0.159 secs 2.363 MB/sec

-- 
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
manu%netbsd.org@localhost