mbuf_jumbo_9k & iSCSI failing

[Andrey V. Elsukov]

On 26.06.2017 19:26, Matt Joras wrote:
> I didn't think that ixgbe(4) still suffered from this problem, and we
> use it in the same situations rstone mentioned above. Indeed, ixgbe(4)
> doesn't presently suffer from this problem (you can see that in your
> patch, as it is only effectively changing the other drivers), though
> it used to. It looks like it was first fixed to not to in r280182.
> 

Yes, actually we have this patch since 8.x. Recent drivers aren't
affected by this problem. iflib also has the code:

#ifndef CONTIGMALLOC_WORKS
        else
                fl->ifl_buf_size = MJUMPAGESIZE;
#else
        else if (sctx->isc_max_frame_size <= 4096)
                fl->ifl_buf_size = MJUMPAGESIZE;
        else if (sctx->isc_max_frame_size <= 9216)
                fl->ifl_buf_size = MJUM9BYTES;
        else
                fl->ifl_buf_size = MJUM16BYTES;
#endif

that seems by default doesn't use 9-16k mbufs.

-- 
WBR, Andrey V. Elsukov

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