On Sun, 2011-10-02 at 11:45 +0200, Radosław Korzeniewski wrote:
Hello,
2011/9/30 reaper <bacula-forum AT backupcentral DOT com>
sounds like your sysctl.conf needs tweaking? have you tried something like this on both sides?
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
These are the IPC (inter process communication) kernel parameters and have nothing about network tuning and AFAIK Bacula doesn't use IPC. I'm not suprised that there was no effect. :)
hi radoslaw, hi reaper,
yes -- i have just sniffed to some traffic and done a backup over 100mbit network -- here are the results
zurich running bacula-dir and bacula-sd (backup server)
copenhagen running bacula-fd (backup client)
heres the 3 way handshake (bolding is mine)
No. Time Source Destination Protocol Info
1 0.000000 zurich copenhagen TCP 33252 > bacula-fd [SYN] Seq=0 Win=5840 Len=0 MSS=1460 SACK_PERM=1 TSV=2129448587 TSER=0 WS=6
Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
Linux cooked capture
Internet Protocol, Src: zurich (zurich), Dst: copenhagen (copenhagen)
Transmission Control Protocol, Src Port: 33252 (33252), Dst Port: bacula-fd (9102), Seq: 0, Len: 0
Source port: 33252 (33252)
Destination port: bacula-fd (9102)
[Stream index: 0]
Sequence number: 0 (relative sequence number)
Header length: 40 bytes
Flags: 0x02 (SYN)
Window size: 5840
Checksum: 0xa51b [validation disabled]
Options: (20 bytes)
Maximum segment size: 1460 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 2129448587, TSecr 0
NOP
Window scale: 6 (multiply by 64)
No. Time Source Destination Protocol Info
2 0.000036 copenhagen zurich TCP bacula-fd > 33252 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1460 SACK_PERM=1 TSV=1494684643 TSER=2129448587 WS=8
Frame 2: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
Linux cooked capture
Internet Protocol, Src: copenhagen (copenhagen), Dst: zurich (zurich)
Transmission Control Protocol, Src Port: bacula-fd (9102), Dst Port: 33252 (33252), Seq: 0, Ack: 1, Len: 0
Source port: bacula-fd (9102)
Destination port: 33252 (33252)
[Stream index: 0]
Sequence number: 0 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 40 bytes
Flags: 0x12 (SYN, ACK)
Window size: 5792
Checksum: 0xa123 [validation disabled]
Options: (20 bytes)
Maximum segment size: 1460 bytes
TCP SACK Permitted Option: True
Timestamps: TSval 1494684643, TSecr 2129448587
NOP
Window scale: 8 (multiply by 256)
[SEQ/ACK analysis]
No. Time Source Destination Protocol Info
3 0.023054 zurich copenhagen TCP 33252 > bacula-fd [ACK] Seq=1 Ack=1 Win=5888 Len=0 TSV=2129448610 TSER=1494684643
Frame 3: 68 bytes on wire (544 bits), 68 bytes captured (544 bits)
Linux cooked capture
Internet Protocol, Src: zurich (zurich), Dst: copenhagen (copenhagen)
Transmission Control Protocol, Src Port: 33252 (33252), Dst Port: bacula-fd (9102), Seq: 1, Ack: 1, Len: 0
Source port: 33252 (33252)
Destination port: bacula-fd (9102)
[Stream index: 0]
Sequence number: 1 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 32 bytes
Flags: 0x10 (ACK)
Window size: 5888 (scaled)
Checksum: 0xe61d [validation disabled]
Options: (12 bytes)
NOP
NOP
Timestamps: TSval 2129448610, TSecr 1494684643
[SEQ/ACK analysis]
zurich and copenhagen are 22.589 ms apart on a shared 100mbit connection -- using the bandwidth delay product:
theoretical
bandwidth delay productBits bitsPerByte bytesInWindow
500 000 000 * .022589 = 11 294 50 / 8 = 1 411 813
actual
windowSizeBytes windowScale bytesInWindow delay throughputBytesPerSecond bitsPerSecond
5840 * 64 = 373 760 zurich -> copenhagen / .022589 16 546 107 * 8 132 368 856
5888 * 256 = 1 507 328 copenhagen -> zurich / .022589 66 728 408 * 8 533 827 264
i backed up about 16GB of data uncompressed from copenhagen to zurich at around 60mbits/s.
i am lost as far as bacula's window calculation -- it thinks that i have a 500mbit connection?
cheers
m
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