Frequent hickups on the networking layer

[Mark Schouten]

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,

-- 
Kerio Operator in de Cloud? https://www.kerioindecloud.nl/
Mark Schouten  | Tuxis Internet Engineering
KvK: 61527076 | http://www.tuxis.nl/
T: 0318 200208 | info at tuxis.nl
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