Good day.
While trying to test vmxnet3s's LSO functionality under
Illumos (it is an OpenSolaris-based OS), I noticed, that
throughput was dramatically slow - about 200-300 Kbits/Sec.
Investigation led me to the fact that HW_LSO flag is resolved
in a wrong way in '
Here is the patch that fixes the problem:
@@ -103,13 +103,19 @@ vmxnet3_tx_prepare_offload(vmxnet3_softc_t *dp,
mblk_t *mp)
{
int ret = 0;
- uint32_t start, stuff, value, flags;
+ uint32_t start, stuff, value, flags, lsoflags, mss;
ol->om = VMXNET3_OM_NONE;
ol->hlen = 0;
ol->msscof = 0;
hcksum_retrieve(mp, NULL, NULL, &start, &stuff, NULL, &value,
&flags);
+
+ mac_lso_get(mp, &mss, &lsoflags);
+ if (lsoflags & HW_LSO) {
+ flags |= HW_LSO;
+ }
+
Sincerely,
Michael Tsymbalyuk
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