Hi!
Thank you for the tips!
Sorry, for the long mail, but I wanna show you some server statistics.
To answer a few further questions:
1. sysctl -w net.inet.ip.mtudisc=0
doesn't have any effect
2. no important messages in /var/log/messages during up-/download
3. Samba downloads show similar behaviour
4. And I ran some further tests with ifstat, iostat and netperf
(see below)
My assumptions:
I think there are some problems with my hdd, especially when dmesg says:
-----
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 512
c_skip: 0
wd0e: DMA error writing fsbn 2651200 of 2651200-2651211 (wd0 bn 3819472; cn
3789 tn 2 sn 34), retrying
wd0: soft error (corrected)
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 0
c_skip: 0
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 512
c_skip: 0
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 8192
c_skip: 0
wd0e: device timeout writing fsbn 2651200 of 2651200-2651215 (wd0 bn 3819472;
cn 3789 tn 2 sn 34), retrying
wd0: soft error (corrected)
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 512
c_skip: 0
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 512
c_skip: 0
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 512
c_skip: 0
wd0(pciide0:0:0): timeout
type: ata
c_bcount: 6144
c_skip: 0
wd0e: device timeout writing fsbn 2653908 of 2653908-2653919 (wd0 bn 3822180;
cn 3791 tn 13 sn 33), retrying
wd0: soft error (corrected)
----
After running a self test with smartctl the results do not look very good:
----
Num Test_Description Status Remaining LifeTime(hours)
LBA_of_first_error
# 1 Extended offline Completed: read failure 40% 2076
169914
----
And if you have a look at the iostat results you can see repeating patterns
like these:
----
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
64.00 1 0.06 64 1 3.50 1 0 0 0 99
0.00 0 0.00 0 0 0.00 1 0 0 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 1 99
----
Does that mean that the hdd is busy during the 'zero-lines' while there is no
more data transfer through the IO controller? The 3.5 seconds cannot be a
real meassured value, because they were recorded during a span of 1
second. So the transfer actually has to extend to the next 3 seconds. But there
it is no longer displayed in the statistics. (I hope you know what I want to
say.)
So I think the problem is my hdd.
What do you think?
Jo
netserver on OpenBSD box
netperf on Linux box
> netperf -H <OpenBSD> -l 20
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
16384 16384 16384 20.02 7.74
netserver on Linux box
netperf on OpenBSD box
> netperf -H <Linux> -l 20
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 20.02 7.89
------------------------------------------------------------
12 MB upload via scp (Linux host -> OpenBSD server)
with scp running on Linux box and sshd running on OpenBSD
> iostat -w 1 -D -d -C wd0
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
15.10 0 0.00 2 0 0.99 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 16 0 5 0 79
16.00 5 0.08 79 5 5.95 0 0 0 0100
16.00 1 0.02 16 1 0.99 0 0 0 0100
0.00 0 0.00 0 0 0.00 5 0 4 0 91
15.33 3 0.04 46 3 2.59 0 0 0 0100
24.00 12 0.28 286 12 1.09 5 0 2 2 91
37.33 9 0.33 333 9 1.00 8 0 3 6 83
64.00 14 0.86 882 14 0.97 18 0 8 5 68
64.00 13 0.81 826 13 0.97 17 0 3 9 71
64.00 15 0.93 953 15 1.04 12 0 5 8 75
53.89 19 0.99 1016 19 1.01 22 0 8 4 67
64.00 14 0.86 882 14 0.95 21 0 5 8 66
64.00 15 0.93 953 15 1.02 22 0 6 9 63
64.00 15 0.93 953 15 0.98 30 0 9 6 55
56.00 18 0.97 992 18 1.00 13 0 10 9 68
64.00 13 0.81 826 13 1.00 19 0 5 5 71
64.00 14 0.87 889 14 0.95 12 0 5 4 79
64.00 15 0.93 953 15 1.07 26 0 8 2 64
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
64.00 15 0.92 945 15 0.98 15 0 5 5 75
64.00 3 0.19 191 3 0.20 6 0 2 2 90
0.00 0 0.00 0 0 0.00 0 0 0 0100
12 MB download via scp (OpenBSD server -> Linux host)
with scp running on Linux box and sshd running on OpenBSD
> iostat -w 1 -D -d -C wd0
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
15.16 0 0.00 2 0 0.99 0 0 0 0100
16.00 6 0.09 95 6 0.98 1 0 1 0 98
7.60 5 0.04 38 5 0.98 2 0 3 0 95
22.00 6 0.13 130 6 0.78 13 0 2 0 85
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
29.43 7 0.20 204 7 3.42 9 0 4 2 86
16.00 2 0.03 32 2 0.92 1 0 0 0 99
0.00 0 0.00 0 0 0.00 0 0 1 1 98
48.00 1 0.05 47 1 2.62 1 0 1 2 97
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
48.00 1 0.05 47 1 2.60 1 0 0 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
22.00 8 0.17 175 8 3.54 2 0 0 0 98
61.00 16 0.94 961 16 1.15 23 0 9 3 65
64.00 15 0.93 953 15 0.99 16 0 14 4 66
64.00 3 0.19 191 3 0.23 2 0 4 1 93
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 1 0 0 0 99
64.00 1 0.06 64 1 2.90 2 0 0 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.50 1 0 0 0 99
0.00 0 0.00 0 0 0.00 1 0 0 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 1 99
64.00 1 0.06 64 1 3.51 2 0 0 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.56 1 0 0 3 96
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 14 0.87 889 14 2.32 16 0 5 2 78
64.00 12 0.74 756 12 0.78 16 0 4 3 77
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
37.00 2 0.07 73 2 3.35 2 0 1 1 97
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
0.00 0 0.00 0 0 0.00 0 0 0 1 99
0.00 0 0.00 0 0 0.00 0 0 0 1 99
64.00 1 0.06 63 1 3.49 2 0 1 0 98
0.00 0 0.00 0 0 0.00 0 0 1 0 99
0.00 0 0.00 0 0 0.00 0 0 1 0 99
0.00 0 0.00 0 0 0.00 0 0 1 0 99
64.00 1 0.06 63 1 3.47 1 0 0 1 98
0.00 0 0.00 0 0 0.00 0 0 1 0 99
0.00 0 0.00 0 0 0.00 0 0 1 0 99
40.00 2 0.08 78 2 3.50 2 0 1 0 98
64.00 5 0.31 320 5 1.33 3 0 1 0 96
64.00 15 0.93 953 15 1.02 16 0 8 9 67
64.00 14 0.87 889 14 0.93 16 0 6 5 72
0.00 0 0.00 0 0 0.00 1 0 1 2 97
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 2.89 1 0 0 1 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 1 0 0 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.49 1 0 1 0 98
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.53 1 0 1 2 97
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.62 2 0 0 0 98
0.00 0 0.00 0 0 0.00 0 0 0 1 99
64.00 16 0.99 1016 16 2.57 18 0 5 3 74
64.00 10 0.62 635 10 0.65 15 0 5 3 78
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.38 1 0 2 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.57 2 0 0 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
64.00 1 0.06 64 1 3.53 1 0 1 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 1 0 99
64.00 1 0.06 64 1 3.44 2 0 0 0 98
64.00 8 0.50 508 8 1.46 8 0 2 0 91
64.00 14 0.86 882 14 0.97 20 0 7 1 72
64.00 12 0.74 762 12 0.76 13 0 6 6 74
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 1.95 2 0 0 1 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.41 1 0 0 1 98
0.00 0 0.00 0 0 0.00 0 0 1 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.56 2 0 0 0 98
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
0.00 0 0.00 0 0 0.00 0 0 0 0100
64.00 1 0.06 64 1 3.42 1 0 1 0 98
wd0 wd0 cpu
KB/t t/s MB/s KB xfr time us ni sy in id
0.00 0 0.00 0 0 0.00 0 0 0 1 99
53.33 6 0.31 318 6 2.69 9 0 4 2 86
0.00 0 0.00 0 0 0.00 0 0 1 0 99
0.00 0 0.00 0 0 0.00 0 0 0 0100
------------------------------------------------------------
12 MB upload via scp (Linux host -> OpenBSD server)
with scp running on Linux box and sshd running on OpenBSD
> ifstat -i rl0
rl0
KB/s in KB/s out
2.00 2.79
1.37 1.88
0.06 0.14
0.06 0.14
152.88 6.40
920.79 34.67
919.38 33.85
989.65 36.71
1002.80 37.30
985.28 36.84
985.25 36.22
995.49 36.99
993.99 36.99
977.97 36.68
991.13 36.91
972.06 36.25
991.11 36.91
418.51 16.06
0.06 0.14
12 MB download via scp (OpenBSD server -> Linux host)
with scp running on Linux box and sshd running on OpenBSD
> ifstat -i rl0
rl0
KB/s in KB/s out
0.13 0.28
3.24 4.38
0.06 0.14
0.06 0.14
3.80 151.34
2.20 50.73
0.06 0.22
0.06 0.14
1.21 50.51
0.06 0.14
0.06 0.14
1.71 50.51
0.06 0.14
0.06 0.14
2.26 67.33
20.13 891.52
21.47 935.40
9.40 387.99
0.06 0.14
0.06 0.14
2.15 67.25
0.06 0.14
0.06 0.14
2.14 66.74
0.06 0.14
0.06 0.14
0.06 0.14
2.15 67.25
0.06 0.14
0.06 0.14
2.15 67.25
0.06 0.14
16.42 710.76
23.80 1032.86
0.51 1.47
0.06 0.14
0.06 0.14
2.09 67.25
0.06 0.14
0.06 0.14
2.09 67.25
0.06 0.14
0.06 0.14
0.06 0.14
2.02 67.25
0.06 0.14
0.06 0.14
1.71 67.25
4.41 187.77
21.90 953.06
22.83 994.77
3.86 145.55
0.06 0.14
0.06 0.14
1.71 67.25
0.38 0.14
0.06 0.14
0.06 0.14
1.64 67.25
0.06 0.14
0.06 0.14
1.71 67.25
0.06 0.14
0.06 0.14
0.06 0.14
rl0
KB/s in KB/s out
2.09 67.49
0.13 0.14
21.01 933.30
19.18 811.61
0.06 0.22
0.06 0.14
0.06 0.14
1.64 67.33
0.06 0.14
0.06 0.14
1.64 67.33
0.06 0.14
0.06 0.14
0.19 11.96
1.58 55.51
0.06 0.14
0.06 0.14
1.64 67.33
8.66 393.12
21.90 954.54
21.96 934.33
0.06 0.22
1.64 67.33
0.06 0.14
0.06 0.14
0.06 0.14
1.64 67.33
0.06 0.14
0.06 0.14
1.71 67.25
0.06 0.22
0.06 0.14
0.06 0.14
1.64 67.33
0.06 0.14
5.18 240.95
2.74 88.13
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