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shodanshok
d9de079a4b
The original ARC paper called for an initial 50/50 MRU/MFU split and this is accounted in various places where arc_p = arc_c >> 1, with further adjustment based on ghost lists size/hit. However, in current code both arc_adapt() and arc_get_data_impl() aggressively grow arc_p until arc_c is reached, causing unneeded pressure on MFU and greatly reducing its scan-resistance until ghost list adjustments kick in. This patch restores the original behavior of initially having arc_p as 1/2 of total ARC, without preventing MRU to use up to 100% total ARC when MFU is empty. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Gionatan Danti <g.danti@assyoma.it> Closes #14137 Closes #14120