1 files changed, 0 insertions, 64 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/network/1402755 b/results/classifier/deepseek-2-tmp/output/network/1402755
deleted file mode 100644
index 52201baf..00000000
--- a/results/classifier/deepseek-2-tmp/output/network/1402755
+++ /dev/null
@@ -1,64 +0,0 @@
-
-qemu-kvm: e1000 RX ring is filled with partial-pkt of size 0
-
-Hello,
-We are using CentOS 6.5 with qemu-kvm-0.12.1.2-2.415 as a host of or VMs.
-In the VM we use e1000 as the NIC emulation.
-We've modified the e1000 driver to our needs. This modification start the RX engine while the RX ring is empty (RDH == RDT)
-and at a later stage we fill the RX descriptors with buffers. This scheme works well on intel chips and VMware.
-What we observe in this setup is that from time to time the RX ring is filled with "partial packets" of size 0 (meaning, DD bit is set,
-No other status bits are set and packet size is also 0).
-
-Looking at the e1000 RX routine in qemu-kvm you can observe the following flow:
-1. A packet is avail for receive:
-2. The routine checks for RCTL_EN - it is enabled
-3. The routine checks that the RDH equal RDT (they are as the ring is empty) but also checks if rxov is on (it is still off) so it doesn’t
-Exit as it is supposed to.
-4. The routine now updates the descriptor status with the DD bit (and vlan which we don’t care)
-5. The routine checks if a buffer address is not NULL (it is as NULL since we haven’t filled it yet) – so is logs something.
-6. The routine now updates the guest memory with this value (DD is 1) 
-7. The routine updates the check_rxov flag in order to allow ovf check the next time around. 
-(but ovf will not occur since in the next iteration RDH != RDT)
-8. The routine loops over all the descriptors with the NULL buffer (which is all our ring) and writes the DD bit
-9. We get this endless partial packet problem we see.
-
-qemu-kvm-0.12.1.2-2.415.el6_5.3/qemu-kvm-0.12.1.2/hw/e1000.c
-static ssize_t
-e1000_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
-{
-: : :
-if (!(s->mac_reg[RCTL] & E1000_RCTL_EN))
-return -1;
-
-: : :
-do {
-if (s->mac_reg[RDH] == s->mac_reg[RDT] && s->check_rxov) {
-set_ics(s, 0, E1000_ICS_RXO);
-return -1;
-}
-base = ((uint64_t)s->mac_reg[RDBAH] << 32) + s->mac_reg[RDBAL] +
-sizeof(desc) * s->mac_reg[RDH];
-cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
-desc.special = vlan_special;
-desc.status |= (vlan_status | E1000_RXD_STAT_DD);
-if (desc.buffer_addr) {
-cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr),
-(void *)(buf + vlan_offset), size);
-desc.length = cpu_to_le16(size);
-desc.status |= E1000_RXD_STAT_EOP|E1000_RXD_STAT_IXSM;
-} else // as per intel docs; skip descriptors with null buf addr
-DBGOUT(RX, "Null RX descriptor!!\n");
-cpu_physical_memory_write(base, (void *)&desc, sizeof(desc));
-
-: : :
-if (++s->mac_reg[RDH] * sizeof(desc) >= s->mac_reg[RDLEN])
-s->mac_reg[RDH] = 0;
-s->check_rxov = 1;
-: : :
-} while (desc.buffer_addr == 0);
-}
-
-
-A workaround is to enable the RX machine only after the descriptor ring is filled for the first time.
-
-Moti
\ No newline at end of file