Hi,
I've got a FreeBSD 10.1-RELEASE box running with iscsi on top of ZFS. I've had
some major issues with it where it would stop processing traffic for a minute
or two, but that's 'fixed' by disabling TSO. I do have frequent iscsi errors,
which are luckily fixed on the iscsi layer, but they do cause an occasional
errormessage on both the iscsi client and server. Also, I see input errors on
the FreeBSD server, but I'm unable to find out what those are. I do see a
relation between iscsi-errormessages and the number of ethernet inputerrors on
the server.
I saw this message [1] which made me have a look at `vmstat -z`, and that shows
me the following:
vmstat -z | head -n 1; vmstat -z | sort -k 6 -t , | tail -10 ITEM
SIZE LIMIT USED FREE REQ FAIL SLEEP zio_data_buf_94208:
94208, 0, 162, 5, 135632, 0, 0 zio_data_buf_98304: 98304,
0, 118, 9, 101606, 0, 0 zio_link_cache: 48,
0, 6, 30870,24853549414, 0, 0 8 Bucket: 64, 0,
145, 2831,148672720, 11, 0 32 Bucket: 256, 0,
859, 731,231513474, 52, 0 mbuf_jumbo_9k: 9216, 604528, 7230,
2002,11764806459,108298123, 0 64 Bucket: 512, 0, 808,
352,147120342,16375582, 0 256 Bucket: 2048, 0, 500,
50,307051808,189685088, 0 vmem btag: 56, 0, 1671605,
1291509,198933250,36431, 0 128 Bucket: 1024, 0, 410,
106,65267164,772374, 0
I am using jumboframes. Could it be that the inputerrors AND my frequent
hickups come from all those failures to allocate 9k jumbo mbufs? And can I
increase the in [1] mentioned sysctls at will?
Thanks
[1]:
https://lists.freebsd.org/pipermail/freebsd-questions/2013-August/252827.html
Met vriendelijke groeten,
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Mark Schouten | Tuxis Internet Engineering
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