Re: [dpdk-dev] [PATCH 0/2] bitmap: add create bitmap with all bits set

[Suanming Mou <suanmingm@mellanox.com>]

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> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Wednesday, March 25, 2020 9:26 PM
> To: cristian.dumitrescu@intel.com
> Cc: dev@dpdk.org; Suanming Mou <suanmingm@mellanox.com>
> Subject: Re: [dpdk-dev] [PATCH 0/2] bitmap: add create bitmap with all bits set
> 
> Call for review, please.
> 
> 
> 10/03/2020 09:21, Suanming Mou:
> > Currently, in the case to use bitmap as resource allocator, after
> > bitmap creation, all the bitmap bits should be set to indicate the bit
> > available. Every time when allocate one bit, search for the set bits
> > and clear it to make it in use.
> >
> > Add a new rte_bitmap_init_with_all_set() function to have a quick fill
> > up the bitmap bits.
> >
> > Comparing with the case create the bitmap as empty and set the bitmap
> > one by one, the new function costs less cycles.
> >
> > For bitmap with 1000 bits, create the bitmap with all bits set costs
> > 754 cycles, while set one by one costs 14194. CPU info as below:
> > Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
> >
> > Suanming Mou (2):
> >   bitmap: add create bitmap with all bits set
> >   test/bitmap: add bitmap create with all bits set case
> >
> >  app/test/test_bitmap.c                     | 57 +++++++++++++++++++++++++++++-
> >  lib/librte_eal/common/include/rte_bitmap.h | 32 +++++++++++++++++
> >  2 files changed, 88 insertions(+), 1 deletion(-)
> >
> >
> 
> 
> 
>