Date: Mon, 22 Jan 2018 18:00:54 +0100 From: =?UTF-8?Q?Karsten_K=c3=b6nig?= <mail@kkoenig.net> To: freebsd-hackers@freebsd.org Subject: Question about 'anonymous' UMA zones Message-ID: <b1b410f4-6bcb-8271-3626-796ce058917e@kkoenig.net>
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Hello y'all, I'm sorry for cross-posting but after second examination this list feels more appropriate for my question. I just played a little bit with the zone allocator of the FreeBSD kernel and observed the following: All 'anonymous' zones (is this the appropriate term?) with a size smaller than 512 Bytes have no slabs in my 11.1-VM. This is not the case on my bare metal server (11.1, too). This is the output: # vmstat -z ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP ... 16: 16, 0, 0, 0, 0, 0, 0 32: 32, 0, 0, 0, 0, 0, 0 64: 64, 0, 0, 0, 0, 0, 0 128: 128, 0, 0, 0, 0, 0, 0 256: 256, 0, 0, 0, 0, 0, 0 512: 512, 0, 7906, 70, 97681, 0, 0 ... I would like to know why this is the case; can someone explain this to me? What happens if I allocate e.g. a 256 Byte buffer? Best, Karsten
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