Hello
I'm testing out ATA-over-Ethernet, and I'm getting very poor results. On the
(only) client, I can't even get read speeds above 1 megabyte per second:
[r...@polaris2 glenn]# hdparm -t /dev/etherd/e1.1
/dev/etherd/e1.1:
Timing buffered disk reads: 4 MB in 5.61 seconds = 729.67 kB/sec
[r...@polaris2 glenn]# hdparm -t /dev/etherd/e1.1
/dev/etherd/e1.1:
Timing buffered disk reads: 4 MB in 5.58 seconds = 734.14 kB/sec
[r...@polaris2 glenn]#
Meanwhile, /dev/etherd/err fills up with these messages:
retransmit e1.1 oldtag=6ad6e...@fffee518 newtag=6ae0e518 s=003048956e79
d=001109c15506 nout=1
retransmit e1.1 oldtag=6b0ae...@fffee590 newtag=6b51e590 s=003048956e79
d=001109c15506 nout=1
retransmit e1.1 oldtag=6c01e...@fffee608 newtag=711ae608 s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=7109e...@fffee680 newtag=711be680 s=003048956e79
d=001109c15506 nout=1
retransmit e1.1 oldtag=7560e...@fffee716 newtag=760ce716 s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=75c4e...@fffee716 newtag=760de716 s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=79dde...@fffee7ac newtag=7a06e7ac s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=7a03e...@fffee7ac newtag=7a07e7ac s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=7be4e...@fffee824 newtag=7c18e824 s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=7bf5e...@fffee824 newtag=7c19e824 s=003048956e79
d=001109c15506 nout=2
retransmit e1.1 oldtag=7e6de...@fffee89c newtag=7e7ee89c s=003048956e79
d=001109c15506 nout=1
retransmit e1.1 oldtag=0072e...@fffee932 newtag=00cfe932 s=003048956e79
d=001109c15506 nout=1
retransmit e1.1 oldtag=06b0e...@fffee9c8 newtag=06c4e9c8 s=003048956e79
d=001109c15506 nout=1
ifconfig shows 0 errors, drops, overruns, frame or carrier errors, on BOTH
sides. Each side is connected using gigabit ethernet with the MTU set to 1500.
On the target side I'm using vblade:
vblade 1 1 eth0 /dev/sda5
On the iniator side I'm using the aoe kernel module included with linux
2.6.27.8.
The weird part is, I can't always reproduce this. When the stars are right and
I modprobe aoe, I get "normal" read speeds, which are about 75% of what the
actual disk is capable of. Just for refence:
[r...@galaxy glenn]# hdparm -t /dev/sda5
/dev/sda5:
Timing buffered disk reads: 188 MB in 3.01 seconds = 62.42 MB/sec
When using other protocols like NFS I get normal read/write speeds, so there's
nothing wrong with the hardware or the network.
What else can I look at?
Thanks,
Best regards,
Glenn
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