CNFS buffers bigger than 2 GB under Linux ?
bill davidsen
davidsen at tmr.com
Thu Mar 21 20:51:31 UTC 2002
In article <20020318123323.I10749 at aegir.fw.belnet.be>,
Antoine Delvaux <antoine.delvaux at belnet.be> wrote:
|
| > > Yes, I'm using raw devices.
| >=20
| > > I wanted to use a single raw devices as under it lies a RAID stripping
| > > setup which already gives me the speed that I want. I don't need much
| > > flexibility neither as this server will be a feed only with nearly no
| > > backlog and so only one article spool.
| >=20
| > Well, you can just use large disk files.
|
| Yes, but this will slow down innd I think, no ? That's why I wanted to=20
| use raw devices.
Looking at the load profile, I can't see that CPU or disk is a
limitation using large files. If you are trying to improve your freenix
every ms counts, otherwise I bet you can't even measure the effect.
time load free buffs swap pgin pgou dk0 dk1 dk2 dk3 ipkt opkt int ctx usr sys idl i_netK o_netK
15.254 0.32 5.8 2087 0.0 64 1675 19 5 6 6 1521 1396 2075 2155 1 4 95 1621.7 1135.6
15.304 0.20 6.4 2088 0.0 64 1642 20 6 5 5 1488 1379 2040 2098 1 4 95 1573.5 1119.4
15.354 0.36 5.6 2086 0.0 66 1602 20 6 5 6 1439 1304 1981 2076 1 4 95 1548.8 1016.5
15.404 0.24 5.3 2087 0.0 69 1651 20 6 5 6 1510 1408 2068 2109 1 4 95 1590.6 1152.9
15.454 0.08 5.2 2088 0.0 56 1231 17 4 4 4 1426 1753 1879 1595 0 4 96 1106.8 1892.0
15.504 0.10 5.0 2089 0.0 58 1165 17 4 4 4 1408 1742 1866 1582 0 3 97 1094.4 1875.1
15.554 0.06 7.1 2086 0.0 56 1216 17 4 4 4 1514 1844 1986 1710 0 4 96 1205.8 1980.0
15.604 0.11 5.0 2083 0.0 72 1400 20 5 5 5 1784 2164 2325 1984 1 5 94 1427.2 2333.0
15.655 0.04 5.5 2084 0.0 78 1579 21 5 5 5 1977 2373 2554 2190 1 5 94 1609.3 2568.6
15.705 0.17 5.3 2081 0.0 85 1561 23 5 6 5 1866 2353 2412 1993 0 5 95 1409.8 2623.2
15.755 0.40 6.5 2082 0.0 64 1040 17 3 4 4 1272 1589 1682 1433 0 3 97 977.2 1723.7
| But does anybody knows where the 2GB limitation for rw devices comes from=
| =20
| ? INND or the Linux kernel ?
From using a raw device... call it a suboptimal configuration choice ;-)
--
bill davidsen <davidsen at tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
More information about the inn-workers
mailing list