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Re: [Xen-devel] [patch merge tree] netfront needs more headroom
| To: | Gerd Knorr <kraxel@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [patch merge tree] netfront needs more headroom |
| From: | Christian Limpach <christian.limpach@xxxxxxxxx> |
| Date: | Thu, 8 Dec 2005 10:50:17 -0800 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Thu, 08 Dec 2005 18:51:03 +0000 |
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| Reply-to: | Christian.Limpach@xxxxxxxxxxxx |
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On 12/7/05, Gerd Knorr <kraxel@xxxxxxx> wrote:
> Raised the headrum size from 200 to 512. I've got "Received packet
> needs 120 bytes more headroom." in my syslog, so 200 is obviously too small.
>
> Increased to 512 as the slab allocator gives out pieces of memory with
> sizes being powers of two, so the old allocation size already was 256
> and anything larger than that will end up being 512 anyway (unless we
> create our own memory pool with custom size ...)
We believe that this is fixed by recent changes to the network driver,
notably these changesets in xen-unstable:
linux-2.6-xen-sparse cset: 4e9c643968ffd0526258dc1ae7d1fee6123be718
linux-2.6-xen-sparse cset: c976c1ff806aa46c989fb5b1d84b311519fb0456
christian
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